【单选题】
<imgdata-url="doc/a@CECAB6621178DA0FC14A9F01B8EABA4A.png"data-preview_url_ueditor="doc/a@CECAB6621178DA0FC14A9F01B8EABA4A.png"src="http://121.251.253.213/doc/a@CECAB6621178DA0FC14A9F01B8EABA4A.png/download?time=635997621331697706&token=72D1725FC09FED1732A810055557DD4C&filename=png"/>
①
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②
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③
<imgdata-url="doc/a@212A7460A6C592A199D4739FD72459E8.png"data-preview_url_ueditor="doc/a@212A7460A6C592A199D4739FD72459E8.png"src="http://121.251.253.213/doc/a@212A7460A6C592A199D4739FD72459E8.png/download?time=635997622563787870&token=B6F54A0208ABA12E4053CC4C58A2BD3D&filename=png"/>
④
<imgdata-url="doc/a@C3233A23DDE52F26000BD720F47B3A0F.png"data-preview_url_ueditor="doc/a@C3233A23DDE52F26000BD720F47B3A0F.png"src="http://121.251.253.213/doc/a@C3233A23DDE52F26000BD720F47B3A0F.png/download?time=635997622856444384&token=D3CB33D68D86784292599FF038F69B64&filename=png"/>
【单选题】
对于线性相关和线性无关,下列说法错误的是()。
②
如果一个向量组线性无关,则该向量组中一定不包含零向量
③
如果一个向量组线性相关,则至少存在一个向量可以由其它向量线性表示
④
如果n阶方阵的行列式为零,则该矩阵的列向量组一定线性无关
【单选题】
设A和B皆为n阶实方阵,则下面论断错误的是()。
①
<SPANstyle="FONT-SIZE:10.5pt;FONT-FAMILY:宋体;mso-bidi-font-size:12.0pt;mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA;mso-ascii-font-family:TimesNewRoman;mso-hansi-font-family:TimesNewRoman;mso-bidi-font-family:TimesNewRoman">A与B</SPAN><SPANlang=EN-USstyle="FONT-SIZE:10.5pt;FONT-FAMILY:TimesNewRoman;mso-bidi-font-size:12.0pt;mso-fareast-font-family:宋体;mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA"><SPANstyle="POSITION:relative;TOP:2pt;mso-text-raise:-2.0pt"></SPAN></SPAN><SPANstyle="FONT-SIZE:10.5pt;FONT-FAMILY:宋体;mso-bidi-font-size:12.0pt;mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA;mso-ascii-font-family:TimesNewRoman;mso-hansi-font-family:TimesNewRoman;mso-bidi-font-family:TimesNewRoman">相似的充要条件是存在可逆阵P</SPAN><SPANstyle="FONT-SIZE:10.5pt;FONT-FAMILY:宋体;mso-bidi-font-size:12.0pt;mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA;mso-ascii-font-family:TimesNewRoman;mso-hansi-font-family:TimesNewRoman;mso-bidi-font-family:TimesNewRoman">,使得A=P<SUP>-1</SUP>BP</SPAN>
②
若A是反对称矩阵,则A<SUP>T</SUP>=-A</P>