成考院校在线答案
- 2022-09-12 [单选] <p class="MsoNormal" style="margin-left:24.0pt;text-indent:-24.0pt;mso-char-indent-count: -2.0;line-height:150%">29、<span style="font-size:12.0pt;line-height:150%; font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">二维随机变量</span><span lang="EN-US" style="font-size:12.0pt; line-height:150%"><span style="position:relative;top:5.0pt;mso-text-raise: -5.0pt"> <!--[if gte vml 1]><v:shape id="_x0000_i1113" type="#_x0000_t75" style='width:34.2pt;height:15.6pt' o:ole=""> <v:imagedata src="xxdsb08.files/image158.wmz" o:title=""></v:imagedata> </v:shape><![endif]--> <!--[if !vml]--><img width="46" height="21" v:shapes="_x0000_i1113" src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image159.png"> <!--[endif]--></span> <!--[if gte mso 9]><xml _tmplitem="2" > <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1113" DrawAspect="Content" ObjectID="_1604819069"> </o:OLEObject> </xml><![endif]--></span><span style="font-size:12.0pt;line-height:150%; font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">概率密度为</span><span lang="EN-US" style="font-size:12.0pt; line-height:150%"><span style="position:relative;top:16.0pt;mso-text-raise: -16.0pt"> <!--[if gte vml 1]><v:shape id="_x0000_i1114" type="#_x0000_t75" style='width:152.4pt;height:37.8pt' o:ole=""> <v:imagedata src="xxdsb08.files/image160.wmz" o:title=""></v:imagedata> </v:shape><![endif]--> <!--[if !vml]--><img width="203" height="50" v:shapes="_x0000_i1114" src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image161.png"> <!--[endif]--></span> <!--[if gte mso 9]><xml _tmplitem="2" > <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1114" DrawAspect="Content" ObjectID="_1604819070"> </o:OLEObject> </xml><![endif]--></span><span style="font-size:12.0pt;line-height:150%; font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">则常数</span><span lang="EN-US" style="font-size:12.0pt; line-height:150%"><span style="position:relative;top:3.0pt;mso-text-raise: -3.0pt"> <!--[if gte vml 1]><v:shape id="_x0000_i1115" type="#_x0000_t75" style='width:12pt;height:14.4pt' o:ole=""> <v:imagedata src="xxdsb08.files/image162.wmz" o:title=""></v:imagedata> </v:shape><![endif]--> <!--[if !vml]--><img width="16" height="19" v:shapes="_x0000_i1115" src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image163.png"> <!--[endif]--></span> <!--[if gte mso 9]><xml _tmplitem="2" > <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1115" DrawAspect="Content" ObjectID="_1604819071"> </o:OLEObject> </xml><![endif]--></span><span style="font-size:12.0pt;line-height:150%; font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">为（</span><span style="font-size:12.0pt;line-height:150%"> </span><span style="font-size:12.0pt;line-height:150%;font-family:Microsoft Yahei;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">）</span><span lang="EN-US" style="font-size:12.0pt;line-height:150%"> <o:p></o:p></span></p>
- 2022-09-12 [单选] <p class="MsoNormal" style="line-height:150%">35、<span style="font-size:12.0pt; line-height:150%;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";mso-font-kerning:0pt">下列矩阵中，不是二次型矩阵的是（</span><span style="font-size:12.0pt;line-height:150%;mso-font-kerning:0pt"> </span><span style="font-size:12.0pt;line-height:150%;font-family:Microsoft Yahei;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman";mso-font-kerning: 0pt">）</span><span lang="EN-US" style="font-size:12.0pt;line-height:150%; mso-font-kerning:0pt"> <o:p></o:p></span></p>
- 2022-09-12 [单选] <p class="MsoNormal">7、<span style="font-size:12.0pt;font-family:Microsoft Yahei;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman";mso-font-kerning: 0pt">已知方阵</span><span lang="EN-US" style="font-size:12.0pt"><span style="position:relative;top:28.0pt;mso-text-raise:-28.0pt"> <!--[if gte vml 1]><v:shape id="_x0000_i1154" type="#_x0000_t75" style='width:94.2pt;height:63pt' o:ole=""> <v:imagedata src="xxds05.files/image144.wmz" o:title=""></v:imagedata> </v:shape><![endif]--> <!--[if !vml]--><img width="126" height="84" v:shapes="_x0000_i1154" src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image145.png"> <!--[endif]--></span> <!--[if gte mso 9]><xml _tmplitem="2" > <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1154" DrawAspect="Content" ObjectID="_1604818963"> </o:OLEObject> </xml><![endif]--></span><span style="font-size:12.0pt;font-family:Microsoft Yahei; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">相似于对角阵，则常数</span><span lang="EN-US" style="font-size:12.0pt"><span style="position:relative; top:3.0pt;mso-text-raise:-3.0pt"> <!--[if gte vml 1]><v:shape id="_x0000_i1155" type="#_x0000_t75" style='width:22.2pt;height:12pt' o:ole=""> <v:imagedata src="xxds05.files/image146.wmz" o:title=""></v:imagedata> </v:shape><![endif]--> <!--[if !vml]--><img width="30" height="16" v:shapes="_x0000_i1155" src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image147.png"> <!--[endif]--></span> <!--[if gte mso 9]><xml _tmplitem="2" > <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1155" DrawAspect="Content" ObjectID="_1604818964"> </o:OLEObject> </xml><![endif]--></span><span style="font-size:12.0pt;font-family:Microsoft Yahei; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">（</span><span style="font-size:12.0pt"> </span><span style="font-size:12.0pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">）</span></p>
- 2022-09-12 [单选] <p class="MsoNormal">8、<span style="font-size:12.0pt;font-family:Microsoft Yahei;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">设随机变量</span><span lang="EN-US" style="font-size:12.0pt">X</span><span style="font-size:12.0pt; font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的方差</span><span lang="EN-US" style="font-size:12.0pt"><span style="position:relative;top:5.0pt;mso-text-raise:-5.0pt"> <!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f"> <v:stroke joinstyle="miter"></v:stroke> <v:formulas> <v:f eqn="if lineDrawn pixelLineWidth 0"></v:f> <v:f eqn="sum @0 1 0"></v:f> <v:f eqn="sum 0 0 @1"></v:f> <v:f eqn="prod @2 1 2"></v:f> <v:f eqn="prod @3 21600 pixelWidth"></v:f> <v:f eqn="prod @3 21600 pixelHeight"></v:f> <v:f eqn="sum @0 0 1"></v:f> <v:f eqn="prod @6 1 2"></v:f> <v:f eqn="prod @7 21600 pixelWidth"></v:f> <v:f eqn="sum @8 21600 0"></v:f> <v:f eqn="prod @7 21600 pixelHeight"></v:f> <v:f eqn="sum @10 21600 0"></v:f> </v:formulas> <v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"></v:path> <o:lock v:ext="edit" aspectratio="t"></o:lock> </v:shapetype><v:shape id="_x0000_i1025" type="#_x0000_t75" style='width:108pt; height:18.6pt' o:ole=""> <v:imagedata src="xxdsb09.files/image001.wmz" o:title=""></v:imagedata> </v:shape><![endif]--> <!--[if !vml]--><img width="144" height="25" v:shapes="_x0000_i1025" src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image002.png"> <!--[endif]--></span> <!--[if gte mso 9]><xml _tmplitem="2" > <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1025" DrawAspect="Content" ObjectID="_1604819097"> </o:OLEObject> </xml><![endif]--></span><span style="font-size:12.0pt;font-family:Microsoft Yahei; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">，则</span><span lang="EN-US" style="font-size:12.0pt">X</span><span style="font-size:12.0pt; font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的数学期望</span><span lang="EN-US" style="font-size:12.0pt"><span style="position:relative;top:5.0pt;mso-text-raise:-5.0pt"> <!--[if gte vml 1]><v:shape id="_x0000_i1026" type="#_x0000_t75" style='width:40.2pt;height:15.6pt' o:ole=""> <v:imagedata src="xxdsb09.files/image003.wmz" o:title=""></v:imagedata> </v:shape><![endif]--> <!--[if !vml]--><img width="54" height="21" v:shapes="_x0000_i1026" src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image004.png"> <!--[endif]--></span> <!--[if gte mso 9]><xml _tmplitem="2" > <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1026" DrawAspect="Content" ObjectID="_1604819098"> </o:OLEObject> </xml><![endif]--></span><span style="font-size:12.0pt;font-family:Microsoft Yahei; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">（</span><span style="font-size:12.0pt"> </span><span style="font-size:12.0pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">）</span><span lang="EN-US" style="mso-bidi-font-size:10.5pt"> <o:p></o:p></span></p>
- 2022-09-12 [单选] <p class="MsoNormal">26、<span style="font-size:12.0pt;font-family:Microsoft Yahei;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">设随机变量</span><span lang="EN-US" style="font-size:12.0pt">X</span><span style="font-size:12.0pt; font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">的分布函数为</span><span lang="EN-US" style="font-size:12.0pt"><span style="position:relative;top:5.0pt;mso-text-raise:-5.0pt"> <!--[if gte vml 1]><v:shape id="_x0000_i1107" type="#_x0000_t75" style='width:27pt;height:15.6pt' o:ole=""> <v:imagedata src="xxdsb07.files/image130.wmz" o:title=""></v:imagedata> </v:shape><![endif]--> <!--[if !vml]--><img width="36" height="21" v:shapes="_x0000_i1107" src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image108.png"> <!--[endif]--></span> <!--[if gte mso 9]><xml _tmplitem="2" > <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1107" DrawAspect="Content" ObjectID="_1604819022"> </o:OLEObject> </xml><![endif]--></span><span style="font-size:12.0pt;font-family:Microsoft Yahei; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">，下列结论中不一定成立的是（</span><span style="font-size:12.0pt"> </span><span style="font-size:12.0pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">）</span><span lang="EN-US" style="mso-bidi-font-size:10.5pt"> <o:p></o:p></span></p>
- 2022-09-12 [单选] <p class="MsoNormal">10、<span style="font-size:12.0pt;font-family:Microsoft Yahei;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">设随机事件</span><span lang="EN-US" style="font-size:12.0pt">A</span><span style="font-size:12.0pt; font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">与</span><span lang="EN-US" style="font-size:12.0pt">B</span><span style="font-size:12.0pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">相互独立，</span><span lang="EN-US" style="font-size:12.0pt"><span style="position:relative;top:5.0pt;mso-text-raise: -5.0pt"> <!--[if gte vml 1]><v:shape id="_x0000_i1058" type="#_x0000_t75" style='width:88.8pt;height:15.6pt' o:ole=""> <v:imagedata src="xxdsb06.files/image067.wmz" o:title=""></v:imagedata> </v:shape><![endif]--> <!--[if !vml]--><img width="118" height="21" v:shapes="_x0000_i1058" src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image068.png"> <!--[endif]--></span> <!--[if gte mso 9]><xml _tmplitem="2" > <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1058" DrawAspect="Content" ObjectID="_1604818921"> </o:OLEObject> </xml><![endif]--></span><span style="font-size:12.0pt;font-family:Microsoft Yahei; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">，则</span><span lang="EN-US" style="font-size:12.0pt"><span style="position:relative; top:5.0pt;mso-text-raise:-5.0pt"> <!--[if gte vml 1]><v:shape id="_x0000_i1059" type="#_x0000_t75" style='width:57.6pt;height:15.6pt' o:ole=""> <v:imagedata src="xxdsb06.files/image069.wmz" o:title=""></v:imagedata> </v:shape><![endif]--> <!--[if !vml]--><img width="77" height="21" v:shapes="_x0000_i1059" src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image070.png"> <!--[endif]--></span> <!--[if gte mso 9]><xml _tmplitem="2" > <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1059" DrawAspect="Content" ObjectID="_1604818922"> </o:OLEObject> </xml><![endif]--></span><span style="font-size:12.0pt;font-family:Microsoft Yahei; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">（</span><span style="font-size:12.0pt"> </span><span style="font-size:12.0pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">）</span><span lang="EN-US" style="mso-bidi-font-size:10.5pt"> <o:p></o:p></span></p>
- 2022-09-12 [单选] <p class="MsoNormal">7、<span style="font-size:12.0pt;font-family:Microsoft Yahei;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman";mso-font-kerning: 0pt">非齐次线性方程组</span><span lang="EN-US" style="font-size:12.0pt"><span style="position:relative;top:18.0pt;mso-text-raise:-18.0pt"> <!--[if gte vml 1]><v:shape id="_x0000_i1165" type="#_x0000_t75" style='width:139.2pt;height:43.2pt' o:ole=""> <v:imagedata src="xxds04.files/image191.wmz" o:title=""></v:imagedata> </v:shape><![endif]--> <!--[if !vml]--><img width="186" height="58" v:shapes="_x0000_i1165" src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image192.png"> <!--[endif]--></span> <!--[if gte mso 9]><xml _tmplitem="2" > <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1165" DrawAspect="Content" ObjectID="_1604818944"> </o:OLEObject> </xml><![endif]--></span><span style="font-size:12.0pt;font-family:Microsoft Yahei; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">有解的充要条件是（</span><span style="font-size:12.0pt"> </span><span style="font-size:12.0pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">）</span></p>
- 2022-09-12 [单选] <p class="MsoNormal" style="line-height:20.0pt;mso-line-height-rule:exactly">26、<span lang="EN-US"> <!--[if gte vml 1]><v:shape id="图片_x0020_189" o:spid="_x0000_i1213" type="#_x0000_t75" style='width:333pt;height:22.2pt; mso-position-horizontal-relative:page;mso-position-vertical-relative:page'> <v:imagedata src="xxds02.files/image195.png" o:title=""></v:imagedata> </v:shape><![endif]--> <!--[if !vml]--><img width="444" height="30" v:shapes="图片_x0020_189" src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image195.png"> <!--[endif]--></span><span lang="EN-US" style="mso-bidi-font-size:10.5pt"> <o:p></o:p></span></p>
- 2022-09-12 [单选] <p class="MsoNormal" style="line-height:20.0pt;mso-line-height-rule:exactly">9、<span lang="EN-US"> <!--[if gte vml 1]><v:shape id="图片_x0020_174" o:spid="_x0000_i1198" type="#_x0000_t75" style='width:137.4pt;height:21pt; mso-position-horizontal-relative:page;mso-position-vertical-relative:page'> <v:imagedata src="xxds02.files/image180.png" o:title=""></v:imagedata> </v:shape><![endif]--> <!--[if !vml]--><img width="183" height="28" v:shapes="图片_x0020_174" src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image180.png"> <!--[endif]--></span><span lang="EN-US" style="mso-bidi-font-size:10.5pt"> <o:p></o:p></span></p>
- 2022-09-12 [单选] <p class="MsoNormal" align="left" style="text-align:left;mso-pagination:widow-orphan; vertical-align:middle">16、<span lang="EN-US"> <!--[if gte vml 1]><v:shape id="图片_x0020_13" o:spid="_x0000_i1037" type="#_x0000_t75" style='width:417.6pt;height:88.8pt; mso-position-horizontal-relative:page;mso-position-vertical-relative:page'> <v:imagedata src="xxds01.files/image013.png" o:title=""></v:imagedata> </v:shape><![endif]--> <!--[if !vml]--><img width="557" height="118" v:shapes="图片_x0020_13" src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image013.png"> <!--[endif]--></span><span lang="EN-US" style="mso-bidi-font-size:10.5pt"> <o:p></o:p></span></p>