2023汤家凤强化5套卷无水印PDF 23汤家凤强化班网课(旗胜考研)
<div class="index-module_articleWrap_2Zphx "><div class="index-module_mediaWrap_213jB index-module_newStyle_lg-fl "><div class="index-module_contentImg_JmmC0"></div></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p data-from-paste="1">23考研汤家凤《强化5套卷(数二)》【解析册】高清无水印电子版PDF</p><p></p></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p data-from-paste="1">23考研汤家凤,《强化5套卷(数二)》【试题册】高清无水印电子版PDF</p><p></p></div><div class="index-module_mediaWrap_213jB index-module_newStyle_lg-fl "><div class="index-module_contentImg_JmmC0"></div></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p data-from-paste="1">23考研汤家凤《强化5套卷(数三)》【解析册】高清无水印电子版PDF</p><p></p></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p data-from-paste="1">23考研汤家凤,《强化5套卷(数三)》【试题册】高清无水印电子版PDF</p><p></p></div><div class="index-module_mediaWrap_213jB index-module_newStyle_lg-fl "><div class="index-module_contentImg_JmmC0"></div></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p data-from-paste="1">23考研汤家凤《强化5套卷(数一)》【解析册】高清无水印电子版PDF</p><p></p></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p data-from-paste="1">23考研汤家凤《强化5套卷(数一)》【试题册】高清无水印电子版PDF</p><p></p></div><div class="index-module_mediaWrap_213jB index-module_newStyle_lg-fl "><div class="index-module_contentImg_JmmC0"></div></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p data-from-paste="1"><strong data-diagnose-id="33487349928c99cf77938b007f96bc52">高清无水印电子版PDF带目录可搜索 可复制 可打印</strong></p><p></p></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p data-from-paste="1"><strong data-diagnose-id="bd7b93815f049cec92fcf9cbdef04455">高清无水印电子版PDF:旗胜考研</strong></p><p></p></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p data-from-paste="1"><strong data-diagnose-id="e1257470a27be52ed73e49c0f006f45e">考研电子书PDF网站:https://www.pdf2book.com/</strong></p><p></p></div><div class="index-module_mediaWrap_213jB index-module_newStyle_lg-fl "><div class="index-module_contentImg_JmmC0"></div></div><div class="index-module_mediaWrap_213jB index-module_newStyle_lg-fl "><div class="index-module_contentImg_JmmC0"></div></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p data-from-paste="1">针对考研推荐一个全面网站:</p><p></p></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p data-from-paste="1">包含专业课高清无水印pdf</p><p></p></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p data-from-paste="1">公共课高清无水印pdf</p><p></p></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p data-from-paste="1">公共课全程班网课持续更新</p><p></p></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p 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data-from-paste="1">如何下载考研资源,这里推荐最常用的一个网站</p><p></p></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p data-from-paste="1">pdf2book.com</p><p></p></div><div class="index-module_textWrap_3ygOc index-module_newStyle_lg-fl "><p></p><p><span data-from-paste="1" data-diagnose-id="b6e585d727b973d106145aed97a3080b">)</span><span data-from-paste="1" data-diagnose-id="c1086ada28b131c0d1e7322c44987863">由 </span><span data-from-paste="1" data-diagnose-id="4d7719807cbfedbc7742a227765a4538">A </span><span data-from-paste="1" data-diagnose-id="4c46dac863f5ad03f54f8f1fced8099e">HO </span><span data-from-paste="1" data-diagnose-id="b0aa09c2189ede037c8b3e37e2ddb41f">得 </span><span data-from-paste="1" data-diagnose-id="0e6b32f9909eb73bafab1079f9c5d298">r(A) </span><span data-from-paste="1" data-diagnose-id="312e837e1918c862cfdfb1d9c56fd0e7">$ </span><span data-from-paste="1" data-diagnose-id="e9798976b8958fda517bbcf177fe380a">1,</span><span data-from-paste="1" data-diagnose-id="731e7c70a02685ee8e07489bc09531f1">再由 </span><span data-from-paste="1" data-diagnose-id="c0c04f1ed8e692284fb77be91a86cc8b">A</span><span data-from-paste="1" data-diagnose-id="251964cf309738092b03c3552664d469">2 </span><span data-from-paste="1" data-diagnose-id="531611ef8943168d9a17a993050e184e">=O </span><span data-from-paste="1" data-diagnose-id="4cb46eda15c67d8b6acba52ac0cc58ab">得 </span><span data-from-paste="1" data-diagnose-id="24fc9261668453ada70a04c5b2fbdab1">r(A) </span><span data-from-paste="1" data-diagnose-id="a384924aaaba37546f08b9f18189dc0d">+r(A) </span><span data-from-paste="1" data-diagnose-id="c1f4825d2a84deaa6d4a61dedf89e658"> </span><span data-from-paste="1" data-diagnose-id="ed2b1e247a20f4b03dba4e7b4388134e">3,</span><span data-from-paste="1" data-diagnose-id="8db0185d6f97d2f0fc9e6b7035003c35">即 </span><span data-from-paste="1" data-diagnose-id="a81ad1d8bd8434ec355db9622d896754">r(A) </span><span data-from-paste="1" data-diagnose-id="9f80558bc02d76c6b9c8678a34ed94b8">< </span><span data-from-paste="1" data-diagnose-id="216df8173f69ca7584b54c82078839e8">1,</span><span data-from-paste="1" data-diagnose-id="746494a6fdcfd2e63785d092d707004f">从而 </span><span data-from-paste="1" data-diagnose-id="aba1a795708be87ae6025acdf93a7e9d">r(A) </span><span data-from-paste="1" data-diagnose-id="d78597f398fcad9cf57fd35a9462118c">= </span><span data-from-paste="1" data-diagnose-id="14fa8855d86faeba815ebe963504c679">1, </span><span data-from-paste="1" data-diagnose-id="46016dac92e3f276efaf163d344a5230">A </span><span data-from-paste="1" data-diagnose-id="62c947a011b29ebc6ba0369505adf2fb">不对</span><span data-from-paste="1" data-diagnose-id="000a32924472e47be7d7eea21edfee07">; </span><span data-from-paste="1" data-diagnose-id="ffc8e03cae813167ec774cc1c4132ce9">因为</span><span data-from-paste="1" data-diagnose-id="aee1ada0cf19630720106728b08fed03">r </span><span data-from-paste="1" data-diagnose-id="5544f3622b59ef2a1fe50352c32de063">(A</span><span data-from-paste="1" data-diagnose-id="ab8d784fe991b2211131fd98cc5f58b3">) </span><span data-from-paste="1" data-diagnose-id="f98cb0486495f843752aa8a7ea533f27">=m</span><span data-from-paste="1" data-diagnose-id="e1077fb9b371c5f33c8a2d3af038a0ac">且加</span><span data-from-paste="1" data-diagnose-id="1fae760074d7bde41bc242c97e0ff0d9">V</span><span data-from-paste="1" data-diagnose-id="270f20d7477fc789d3884f84af9f4b8e">”</span><span data-from-paste="1" data-diagnose-id="5b2beeb942dd62e656cbc25547aeba6e">,</span><span data-from-paste="1" data-diagnose-id="5c9c7e55f67e4fbea7a299deb1c059f7">所以</span><span data-from-paste="1" data-diagnose-id="0859b31c6894310dbe791ef252f59e0f">A</span><span data-from-paste="1" data-diagnose-id="6ff5b8ea49b0c4ae77c4edfa81b8a4bb">经过若干次初等列变换可化为</span><span data-from-paste="1" data-diagnose-id="00ab6231a3664cf62bd2b7fc24a60931">(</span><span data-from-paste="1" data-diagnose-id="dba57d583bd4ec72f80b7584ccff401a">E </span><span data-from-paste="1" data-diagnose-id="4ff31857776b10c843f714a7122e3047">i </span><span data-from-paste="1" data-diagnose-id="a64451973dfdefb04d729358f7ccf204">O) </span><span data-from-paste="1" data-diagnose-id="3720420cdcabb634fa78df762370fa23">,B</span><span data-from-paste="1" data-diagnose-id="6050139c2b070af36fb90642de690a20">不对</span><span data-from-paste="1" data-diagnose-id="1aefae5ee62835c15adb863a084ebb73">; </span><span data-from-paste="1" data-diagnose-id="c55b2fde7c5fc489d046cabad8c159f6">因为</span><span data-from-paste="1" data-diagnose-id="22193b9628134d2f5fad7b8d78ea0a8b">r(A</span><span data-from-paste="1" data-diagnose-id="f05e16340af2768b80ce019cd9402081">T</span><span data-from-paste="1" data-diagnose-id="5f74d77b7e6ba393e8bab13c5d1928b9">A)= </span><span data-from-paste="1" data-diagnose-id="f71136f3c2b681a1c1cf243f12b1ce45">r(A)= </span><span data-from-paste="1" data-diagnose-id="5ad5e7373385c698335707de5657ba3d">m<n,</span><span data-from-paste="1" data-diagnose-id="b97bd65baa1f1598ff39119fe6c1578d">即</span><span data-from-paste="1" data-diagnose-id="f609ad52c7a3ce1f2bb468e033e1b7e7">“</span><span data-from-paste="1" data-diagnose-id="1e08d0844142126b267777b20ca1932d">A</span><span data-from-paste="1" data-diagnose-id="299692d4f172aa89840c4e6207c4dfbf">为降秩矩阵</span><span data-from-paste="1" data-diagnose-id="3aa67f30982a1a85fed27430691d2bdd">,</span><span data-from-paste="1" data-diagnose-id="b9dac9612fd34c3b398c0818f6905152">所以人丁人不是正定矩阵</span><span data-from-paste="1" data-diagnose-id="d3bc644cf44beedb9ef39dcb3d98e476">,</span><span data-from-paste="1" data-diagnose-id="87f69c04b6ac9b4ece53497493fd3c01">D</span><span data-from-paste="1" data-diagnose-id="c2f25fb1508df15102f4bf446f1749cb">不对</span><span data-from-paste="1" data-diagnose-id="56963038f6c142bd820c3862131d90d2">, </span><span data-from-paste="1" data-diagnose-id="a40f6e277732f46a32db200d7eac1170">应选</span><span data-from-paste="1" data-diagnose-id="a096cd4fbac6eb2bcd3485b6a23884b4">C. </span><span data-from-paste="1" data-diagnose-id="30120e5ba4bd397f27e7d1e262a78d59">事实上</span><span data-from-paste="1" data-diagnose-id="a5a0c9a15dd65837ab6ea845ecff7cc2">,</span><span data-from-paste="1" data-diagnose-id="72d993d47e5251082156285e8c0af432">存在初等矩阵</span><span data-from-paste="1" data-diagnose-id="5f500ae0734126f9751036794645b979">Q</span><span data-from-paste="1" data-diagnose-id="6ba02651c6b0bef50e2b97fceb0cb3e0">i</span><span data-from-paste="1" data-diagnose-id="b0f145fc80767cb05564f19c9bb96fde">,</span><span data-from-paste="1" data-diagnose-id="0e65d34b5980a0e14457751cf63fc699">Q2</span><span data-from-paste="1" data-diagnose-id="2bda909bdec81f91df97a97eb4ca6f60">,</span><span data-from-paste="1" data-diagnose-id="c41d4f75b5e5feb84857b0bda8d8a0f6">" </span><span data-from-paste="1" data-diagnose-id="7dd534afaf7b1eb254cc4ec22996c58a">,</span><span data-from-paste="1" data-diagnose-id="c770737ec6fc9ae74bbe137bd3234cee">0</span><span data-from-paste="1" data-diagnose-id="aaccccca833828ffffc3b27743b4181b">,</span><span data-from-paste="1" data-diagnose-id="ebf57cf63b3e314377c993ffc2eab221">使得</span><span data-from-paste="1" data-diagnose-id="5661857cae11659589e92fc23c8b2666">AQ@2</span><span data-from-paste="1" data-diagnose-id="6f3e13c999165a53d45e71c06325d174">…</span><span data-from-paste="1" data-diagnose-id="d639f6cb15e306ba8d0440824407361b">Q, </span><span data-from-paste="1" data-diagnose-id="a99ef94c93f7b7a0e72940d29626e6ac">=</span><span data-from-paste="1" data-diagnose-id="a410dfe47b3f3e78ef49744ec2fa3dc7">(</span><span data-from-paste="1" data-diagnose-id="713a123756828df68730fac183914d14">E </span><span data-from-paste="1" data-diagnose-id="c2a620b1161a7064f6800082164cc25d">i </span><span data-from-paste="1" data-diagnose-id="c64a388c6f792c27ce06d6c3e56bf062">O),</span><span data-from-paste="1" data-diagnose-id="f386dd4f34602affe81cafd9ce268cbf">即存在可逆矩阵</span><span data-from-paste="1" data-diagnose-id="380ed4be2fc17cc74af273dcc4c75654">Q, </span><span data-from-paste="1" data-diagnose-id="0ee584ca0730150d4f49585be5f07d22">使得 </span><span data-from-paste="1" data-diagnose-id="1e0c82f9339dbc103b9ccdb28e358316">AQ=(E </span><span data-from-paste="1" data-diagnose-id="5515d35592784bd80fa1fddb5b9d0b5a">\ </span><span data-from-paste="1" data-diagnose-id="f8ed0007fd26776e26b7afba812fa23e">O). </span><span data-from-paste="1" data-diagnose-id="c319753a2215cfcf040d8c33f2248d9e">(S </span><span data-from-paste="1" data-diagnose-id="6be91bbee15791b2a017121bc53d3400">由</span><span data-from-paste="1" data-diagnose-id="f45602a4c30e6d8e0307dbfb95c4ef09">(</span><span data-from-paste="1" data-diagnose-id="dad4aa5ee757cef860e9a60ddb86c1eb">X,Y)</span><span data-from-paste="1" data-diagnose-id="43810040813bca8aded36bb64b2a0ee4"></span><span data-from-paste="1" data-diagnose-id="b79d26dc6ddb7650d94ebbf40fc66882">N(0,l</span><span data-from-paste="1" data-diagnose-id="b8611b7a4d77cf8dbf9795fa06507f5c">;</span><span data-from-paste="1" data-diagnose-id="0b1d61c65ab5658d08d19deeea3330fe">l,4</span><span data-from-paste="1" data-diagnose-id="7beb0b23dbb09d1f118ad88721989b03">;</span><span data-from-paste="1" data-diagnose-id="7c913b43f9f5137e0619d02e7058f98f">0</span><span data-from-paste="1" data-diagnose-id="9dc73d12619b9c156d72ab3a0f784607">)</span><span data-from-paste="1" data-diagnose-id="96a90ed9130a267ea9f6ab212e615565">得 </span><span data-from-paste="1" data-diagnose-id="6004e09e3c289366e25fe6eda3e7cab4">X </span><span data-from-paste="1" data-diagnose-id="7d0413e88adda70049bad4ab440fbbd4"></span><span data-from-paste="1" data-diagnose-id="c06d6b7fdae71d72734d2dddbfb299c0">N(O,1),Y </span><span data-from-paste="1" data-diagnose-id="87f5897a1ed13dff8c14c4fcdfbf664f"></span><span data-from-paste="1" data-diagnose-id="9d0c5b88e3c3965c613f690c4c67cb9b">N </span><span data-from-paste="1" data-diagnose-id="3432248cf26e09469893f13f8bbb7f5e">(1,4),</span><span data-from-paste="1" data-diagnose-id="89a945ed02d7e89af0fe77a2e70c641c">p{x </span><span data-from-paste="1" data-diagnose-id="d9cd4b0515907b14280963f02d729ca9">< </span><span data-from-paste="1" data-diagnose-id="badb1562ef93e126da5a9fc25e30d49d">o} </span><span data-from-paste="1" data-diagnose-id="1e4364d28775c9add3e0668db53c3e96">= </span><span data-from-paste="1" data-diagnose-id="affc07202d686494fd8190ccedd07368">p{x </span><span data-from-paste="1" data-diagnose-id="5b044eefdc75bdf8c1fdda21a9e4ecf6">> </span><span data-from-paste="1" data-diagnose-id="3c7835043acb705532cf21a90ceb70ac">o} </span><span data-from-paste="1" data-diagnose-id="d7a45f41fd944250d7a585dc563baff6">= </span><span data-from-paste="1" data-diagnose-id="26e2fd02872fcbd2724dfa464dffda79">j</span><span data-from-paste="1" data-diagnose-id="52bf9ea90be4b1ac55bc79ec86fa5c39">,</span><span data-from-paste="1" data-diagnose-id="07886950cab77d960dbbcd29c3067cdf">p</span><span data-from-paste="1" data-diagnose-id="694c5d0a7b88242d68245f02bca03175">{</span><span data-from-paste="1" data-diagnose-id="02095c88a60b632b794aceeacc70ac5e">y</span><span data-from-paste="1" data-diagnose-id="b66b5c514ebdbe79cb0eaf7b9110fb45">< </span><span data-from-paste="1" data-diagnose-id="6643f91f53c21561805c462bcf481002">1} </span><span data-from-paste="1" data-diagnose-id="f670b928331674bf1e1d4169703efdc3">=p{y </span><span data-from-paste="1" data-diagnose-id="eef613df129cebb83a1a69b8f79432e8">> </span><span data-from-paste="1" data-diagnose-id="6ddaf3543d4db38c82a63d421c9bcba7">1} </span><span data-from-paste="1" data-diagnose-id="7978fd512f6040e93b4f3f2d35b64de3">= </span><span data-from-paste="1" data-diagnose-id="34a891cbef34b4b53b958538c5e22d1a">j, </span><span data-from-paste="1" data-diagnose-id="b5c3acd1ed33a0b3d46809d7c2a0f061">由</span><span data-from-paste="1" data-diagnose-id="7ceff8cb99007f9b963068f94a5857d1">p=0</span><span data-from-paste="1" data-diagnose-id="5e39929ba91fa10d39fd849b2b96c9b1">得</span><span data-from-paste="1" data-diagnose-id="44ed932c7d2516558bec2fe1cfc7b699">X,Y</span><span data-from-paste="1" data-diagnose-id="88b53584b938dff63b6d7ffd69e3b5c9">相互独立</span><span data-from-paste="1" data-diagnose-id="197188b12fad11fc5219aeb88d0922a8">,</span><span data-from-paste="1" data-diagnose-id="f1709f890f3133cfd6d65f4478d52e52">故 </span><span data-from-paste="1" data-diagnose-id="e69383f1299886a39acad85b6b254c1c">p</span><span data-from-paste="1" data-diagnose-id="a3122b040b04d7ecabc2cf7c44517742">{</span><span data-from-paste="1" data-diagnose-id="01b23c71a8cd162b4f4783e60ac0edc2">xy</span><span data-from-paste="1" data-diagnose-id="1b154f687775da89d015614cada63439">> </span><span data-from-paste="1" data-diagnose-id="0fe1e5860e7dfaa24a11b93e3f9fd1b4">x} </span><span data-from-paste="1" data-diagnose-id="5bdb7d5c7a0681b09612379844f94f95">= </span><span data-from-paste="1" data-diagnose-id="9fd7833455cd3ed2f69b86a95607a8aa">p</span><span data-from-paste="1" data-diagnose-id="f2f528e21dfd8b3216ee52a0113c491e">{</span><span data-from-paste="1" data-diagnose-id="c27898ef3a62222c9ad644fabff497bc">x</span><span data-from-paste="1" data-diagnose-id="ab8f70aec2b048e467533f3ceb6e817d">(</span><span data-from-paste="1" data-diagnose-id="e7dee6f7d64eda3603f5c09a4db3426a">y</span><span data-from-paste="1" data-diagnose-id="ee82f94e9ae4cfe451d5f0cc92798242">- </span><span data-from-paste="1" data-diagnose-id="27eb4ae5308481b48759cda362c722d7">1</span><span data-from-paste="1" data-diagnose-id="f0f2e3d953b5eeb2de40eba8c20abf1f">)</span><span data-from-paste="1" data-diagnose-id="afedbf5b88ca91718d54de6399a3a148">> </span><span data-from-paste="1" data-diagnose-id="cc49d494756347e9f6363e772c7f6144">o} </span><span data-from-paste="1" data-diagnose-id="a0340dca9453826ea2e373669d2ee969">= </span><span data-from-paste="1" data-diagnose-id="f2cacc29c9e4dc21b8e69c4d6a6d6436">f</span><span data-from-paste="1" data-diagnose-id="e914b55b1df28c2956b70e6c38442b5d">{</span><span data-from-paste="1" data-diagnose-id="8c3ac5f5a755520bf60f55cd064e85d0">x </span><span data-from-paste="1" data-diagnose-id="1cb9bb44a32d394ef65b2988ce2cb3e3">> </span><span data-from-paste="1" data-diagnose-id="f33289cabecdb9a04d0f39cbf8d34f5e">o,y> </span><span data-from-paste="1" data-diagnose-id="0678fda20d35b19f1411f5c8ad0643d9">1} </span><span data-from-paste="1" data-diagnose-id="d80944e0301ec0a1022406ad1a24aac4">+</span><span data-from-paste="1" data-diagnose-id="bc6bcc9b9a7da573353f558b85e2b7b3">p</span><span data-from-paste="1" data-diagnose-id="6922c9ec5006022eede1b9977f9e47a7">{</span><span data-from-paste="1" data-diagnose-id="56e5b45a00a9320bdfd5dde38fc5b002">x </span><span data-from-paste="1" data-diagnose-id="06dad46ca63c24a86db67aa3fbadba0e">< </span><span data-from-paste="1" data-diagnose-id="69decfe57932d23927a6b3b74c644806">o,y< </span><span data-from-paste="1" data-diagnose-id="955d473bdf99e6d5fb6fd0ae33b069e6">1} </span><span data-from-paste="1" data-diagnose-id="9a4a12c866c90a5d36ae1666eb627fb7">= </span><span data-from-paste="1" data-diagnose-id="e915574a20e92b7ae180d296ad56648d">p{x </span><span data-from-paste="1" data-diagnose-id="fdcb1e4fa9c2394ce87c6ab24b100044">>o}p{y </span><span data-from-paste="1" data-diagnose-id="872bd30eceef647f185b0928cce317e6">> </span><span data-from-paste="1" data-diagnose-id="274337cca2b2d3ea92e7413819c5c101">1} </span><span data-from-paste="1" data-diagnose-id="225769e7f4a2e4480e4ac6cb56fa7015">+</span><span data-from-paste="1" data-diagnose-id="5db5e176b613ddfbcb4b6a3048e8d8e7">p</span><span data-from-paste="1" data-diagnose-id="000cb37628af23652e12d65275dff029">{</span><span data-from-paste="1" data-diagnose-id="9677d75097a88b24c420c95b7c275f61">x </span><span data-from-paste="1" data-diagnose-id="61c796367502f94f074f40df5a824a7f"><o}p{y </span><span data-from-paste="1" data-diagnose-id="e562c6f411a75a4ddaef8609ac861065">< </span><span data-from-paste="1" data-diagnose-id="5c51e57e35c9f9d4c333a98d641758c8">1} </span><span data-from-paste="1" data-diagnose-id="00f901c9b00b5521791b79949a5d9c74">= </span><span data-from-paste="1" data-diagnose-id="2c1f3ea7bdcf222557a05918b7b01944">j, </span><span data-from-paste="1" data-diagnose-id="77821271827df8eed66edf8be968745a">应选</span><span data-from-paste="1" data-diagnose-id="bac9a27083c719a1f754abbed7de171d">c. </span><span data-from-paste="1" data-diagnose-id="4de7a69f8b62fcd7fd7029590ad61868">A. </span><span data-from-paste="1" data-diagnose-id="8c78b1c3e722e4f9ee658a5573301241">(SK) </span><span data-from-paste="1" data-diagnose-id="816f61a9dc832a209ad25adb932d2fdd">a </span><span data-from-paste="1" data-diagnose-id="7bc1bf7310a1761af4444ebfbb048b99">4n </span><span data-from-paste="1" data-diagnose-id="66db038047844d6e6c413e3fc224cfed">(n_1)s2 </span><span data-from-paste="1" data-diagnose-id="1177add38d0e92051a3bc489bfcee379">t</span><span data-from-paste="1" data-diagnose-id="e6ea686618c563831fb3aa806e254203">2 </span><span data-from-paste="1" data-diagnose-id="a6515755fbfb2042902135b1ecfd9e15">因为 </span><span data-from-paste="1" data-diagnose-id="c02d5e7e1eea91e08435a34f1d4c4d3c">6 </span><span data-from-paste="1" data-diagnose-id="7a8dd25855f32e4e47dd954d429b86a4">a</span><span data-from-paste="1" data-diagnose-id="91980d32d65c25c6725d7466deb8e895">2 </span><span data-from-paste="1" data-diagnose-id="69c4d7e0729f530b9f70cd40c281dc49">N(O,1), </span><span data-from-paste="1" data-diagnose-id="1266d0bc3074385d8b520c36548badef">2 </span><span data-from-paste="1" data-diagnose-id="3ffe0bc786b34c3141d06b57f0f08f46">n(X </span><span data-from-paste="1" data-diagnose-id="2c7d78729a65d9b6ef2040f40a1be274">— </span><span data-from-paste="1" data-diagnose-id="54b640fd5652563fd96651269e7667b0">〃 </span><span data-from-paste="1" data-diagnose-id="254f56e29519e009bc3ae2cb32e48d66"> </span><span data-from-paste="1" data-diagnose-id="2fc196db86dda4ef6eeb9d0f182c4fe8">R </span><span data-from-paste="1" data-diagnose-id="217667a30d00973e7c5928659a0bbacc">n(X </span><span data-from-paste="1" data-diagnose-id="a60e1be6c77c5e2db166dfcf59c9b379">— </span><span data-from-paste="1" data-diagnose-id="2e52ac698cfb03c918302b6e9783eb78">p)2 </span><span data-from-paste="1" data-diagnose-id="e1ef88a4c9bf7296ea17b63d16d4ef63">■■H* </span><span data-from-paste="1" data-diagnose-id="9f2fd6c3c4db002a6c963af9b89618be">o </span><span data-from-paste="1" data-diagnose-id="4765d0b4b5d66dfebb501cba0a98a675">a </span><span data-from-paste="1" data-diagnose-id="3f6a0a79badbbd61ace3d673a4cdb8fd">x</span><span data-from-paste="1" data-diagnose-id="b8d1c9e7a43e5eee32a1e48805ac1650">—</span><span data-from-paste="1" data-diagnose-id="355e7f8c4c25a7b9276f73292d86abdb">〃 </span><span data-from-paste="1" data-diagnose-id="d96c2911e110af8d9c18d5888e5e6f60">a </span><span data-from-paste="1" data-diagnose-id="0732f3383c2e78fbec85094bc7f6c18b">4n </span><span data-from-paste="1" data-diagnose-id="40a886f3f8e43fdd4da49bd832a63a1e">a</span><span data-from-paste="1" data-diagnose-id="50c1ed50a3fb72eea3e29b1719f31388">2 </span><span data-from-paste="1" data-diagnose-id="0618c38d4c2d64d90485778f086da95e">T </span><span data-from-paste="1" data-diagnose-id="fec27a3399eda2b50adad7c6e2ae9c18">即独立得 </span><span data-from-paste="1" data-diagnose-id="911f0f18682de11de59a59bd6d7e7e7b">T </span><span data-from-paste="1" data-diagnose-id="f8349afcff0ca51e86390f14a9e0cd4b">"</span><span data-from-paste="1" data-diagnose-id="3b515bc988611ac437806ced8eb7da7b">(</span><span data-from-paste="1" data-diagnose-id="7da3c9d14cc807a6d25797fbb28e2d68">X</span><span data-from-paste="1" data-diagnose-id="726334c48d449891fd6b85e65ec91cdd">二迁</span><span data-from-paste="1" data-diagnose-id="c5bcb34b90596e8270990fdde781448d">丄</span><span data-from-paste="1" data-diagnose-id="635b3c3f64f99444ae4ab2ce87842565">Z </span><span data-from-paste="1" data-diagnose-id="fc1ccea0fc49117d0052368c0d872759">_ </span><span data-from-paste="1" data-diagnose-id="422ef20fdf483c0e9a1c66b2cdd3b17c">工</span><span data-from-paste="1" data-diagnose-id="1d4f44172e7b864f1d30b630783d5818"></span><span data-from-paste="1" data-diagnose-id="696017e61cd7869bf5b81f80df1146c0">店</span><span data-from-paste="1" data-diagnose-id="e9d9666d64b4f30886ec463d5d528d3c">G</span><span data-from-paste="1" data-diagnose-id="69ad495f334729b2155f6a602aff4c99">)</span><span data-from-paste="1" data-diagnose-id="d5017b6f9b84cb6b405e432414a4bfbe">, </span><span data-from-paste="1" data-diagnose-id="55bda977e950a3ae5037b686a131c9f7">a</span><span data-from-paste="1" data-diagnose-id="b9db13322f3eb86b775dc4a7774bea56">2 </span><span data-from-paste="1" data-diagnose-id="4924c139d7d9fb64ab4e118b16f6f044">a</span><span data-from-paste="1" data-diagnose-id="e50ed4e4bcdbd7c22cb1e5bf28714e7b">2 </span><span data-from-paste="1" data-diagnose-id="fe7f44224ff61a3a5e4a4e2f0e11afae">+ </span><span data-from-paste="1" data-diagnose-id="f0b7fbc47d2fa21426cfa7eb717424c1">A</span><span data-from-paste="1" data-diagnose-id="2dc6fd2746c4772ff696ba801aafe0ef">正确. </span><span data-from-paste="1" data-diagnose-id="a7c15e864c6f8d4ee8a8be9ad384d2ca">实际上</span><span data-from-paste="1" data-diagnose-id="b3e1ba1ed1987ab53d4fc47bf299121d">,</span><span data-from-paste="1" data-diagnose-id="f1fa31151c8955d3d9cfa81ea1c5e22a">由 </span><span data-from-paste="1" data-diagnose-id="94670b8a66ff03e4a0e1e8064716ec43">X </span><span data-from-paste="1" data-diagnose-id="aa58a64ecd687d8a4e0b232b6630a4fb">— </span><span data-from-paste="1" data-diagnose-id="a02a837d74137838513c53da193149d9">p. </span><span data-from-paste="1" data-diagnose-id="850f4e5443b7ddd5834a3814e3fd6419">a </span><span data-from-paste="1" data-diagnose-id="18d93aae7c7738e876b4db864f3e8f2e">4n </span><span data-from-paste="1" data-diagnose-id="1b0e2785f8952683a0fb997dc258973b">(n-l)S</span><span data-from-paste="1" data-diagnose-id="588272757b98b99f91a097c364df5150">2 </span><span data-from-paste="1" data-diagnose-id="320b5f33f919356f28256cd4ecbbf7c1">a</span><span data-from-paste="1" data-diagnose-id="2b1243e7b8309c502dcd3b8faf5ed339">2 </span><span data-from-paste="1" data-diagnose-id="d15bc8fd22935247c59865d06a89220c">T </span><span data-from-paste="1" data-diagnose-id="d7d4f5261f0792da649de9d2408b9e4c">7</span><span data-from-paste="1" data-diagnose-id="15d4a57b6cfb33c101ae5855a17585d0">”</span><span data-from-paste="1" data-diagnose-id="53d3fc9a3ea48de2c1f6d8bac3708781">—</span><span data-from-paste="1" data-diagnose-id="7633f58f72578bf10a641d8476df9730">】</span><span data-from-paste="1" data-diagnose-id="d037e461857f8e52eff04f31d5120e27">) </span><span data-from-paste="1" data-diagnose-id="49e873547c9767e4e1e0deeb0421abca">且 </span><span data-from-paste="1" data-diagnose-id="fbd93e748770c005171ecf6d370d4537">(n </span><span data-from-paste="1" data-diagnose-id="a6c31e722b747ea27d44bdd1e786c839">— </span><span data-from-paste="1" data-diagnose-id="79b38ce3f0a9ab65683998ea363d2311">1) </span><span data-from-paste="1" data-diagnose-id="889e2033c7d05b3292cd483eadea557f"> </span><span data-from-paste="1" data-diagnose-id="1ccc3a91a6195dc19b42ebe118a72d09">即 </span><span data-from-paste="1" data-diagnose-id="a8de5410cca531d067e57a1075f19cbe">J"G_1</span><span data-from-paste="1" data-diagnose-id="7b0431cded7ea3106480263b4dfd900e">)(</span><span data-from-paste="1" data-diagnose-id="17fbfd5ba85a4b884a7568f70dca25e2">X.</span><span data-from-paste="1" data-diagnose-id="658e3760aa71297058ae2cf3cd1dfc54">—</span><span data-from-paste="1" data-diagnose-id="eda7172fa7833d898941635532a9190b">.3 </span><span data-from-paste="1" data-diagnose-id="c7145248f291721d47ae771951035c9d"></span><span data-from-paste="1" data-diagnose-id="08daa158d9cf8cb2fbc5aa362c3cc1dc">应选 </span><span data-from-paste="1" data-diagnose-id="7e51f2d57900115702cfb7e2b31aa14d">a</span><span data-from-paste="1" data-diagnose-id="13e3592b19a774ebdf37b2cca9b94f6a">. </span><span data-from-paste="1" data-diagnose-id="d264b62277b1f5c3f60eb7d61a59a6c8">yr </span><span data-from-paste="1" data-diagnose-id="62c1626785ee0f8973364a01a63012a7">N(O,1), </span><span data-from-paste="1" data-diagnose-id="4a3540e1c61dd9d2912e95778b4f299a">(IE)</span><span data-from-paste="1" data-diagnose-id="e60a55cfc7c80da0e3afaf4f8e574afe">显然</span><span data-from-paste="1" data-diagnose-id="1393d9e5b48534d5a71720f048ed7a34">Yf</span><span data-from-paste="1" data-diagnose-id="906a8611d4e7e00eacd98503f9af6677">与</span><span data-from-paste="1" data-diagnose-id="e8917b1b99bed8faaf4409c694385456">S?</span><span data-from-paste="1" data-diagnose-id="a899024afa2b304051152981b32ba854">相互独立</span><span data-from-paste="1" data-diagnose-id="01f5388c54065e985f666f14f812e7f3">,</span><span data-from-paste="1" data-diagnose-id="a9d8d1d50d5d71d92ff0e5f5d8f98453">则</span><span data-from-paste="1" data-diagnose-id="be68b6be5e04e44b87e0cab8bd78a998">D(T)=D(Y+D(2S2),</span><span data-from-paste="1" data-diagnose-id="17bc6bbb5eb9871d78f6ad321a71fb96">由匕 </span><span data-from-paste="1" data-diagnose-id="76c2c64e5e46160d350ae316755981dd">y </span><span data-from-paste="1" data-diagnose-id="2f05ddb853bafe56cf3c384b26f337f8">N(0,2),</span><span data-from-paste="1" data-diagnose-id="bd05b5863077bc6dbf6c82c9e6a26029">即丄 </span><span data-from-paste="1" data-diagnose-id="9163417b9e70c0799875fb7777330915">V2 </span><span data-from-paste="1" data-diagnose-id="0f79fbc712d3f0bbbc2d11ec6c
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