【单选题】
设4个3维列向量<imgwidth="94"height="26"v:shapes="_x0000_i1127"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image146.png">组成的矩阵经初等行变换后变为<imgwidth="266"height="84"v:shapes="_x0000_i1128"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image148.png">，则<imgwidth="22"height="26"v:shapes="_x0000_i1129"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image150.png">可表示为<imgwidth="38"height="26"v:shapes="_x0000_i1130"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image152.png">（）
①
<imgwidth="92"height="26"v:shapes="_x0000_i1131"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image154.png">
②
<imgwidth="120"height="26"v:shapes="_x0000_i1132"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image156.png">
③
<imgwidth="110"height="26"v:shapes="_x0000_i1133"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image158.png">
④
<imgwidth="56"height="26"v:shapes="_x0000_i1134"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image160.png">
【单选题】
若方阵<imgwidth="18"height="18"v:shapes="_x0000_i1064"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">与<imgwidth="18"height="18"v:shapes="_x0000_i1065"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image032.png">等价，则（）
①
<imgwidth="86"height="22"v:shapes="_x0000_i1066"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image034.png">
②
<imgwidth="202"height="24"v:shapes="_x0000_i1067"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image036.png">
③
<imgwidth="118"height="24"v:shapes="_x0000_i1068"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image038.png">
④
存在可逆矩阵<imgwidth="18"height="18"v:shapes="_x0000_i1069"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image040.png">，使<imgwidth="84"height="22"v:shapes="_x0000_i1070"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image042.png">
【单选题】
设<imgwidth="18"height="18"v:shapes="_x0000_i1106"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image130.png">是<imgwidth="44"height="16"v:shapes="_x0000_i1107"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image132.png">矩阵，则齐次线性方程<imgwidth="54"height="20"v:shapes="_x0000_i1108"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image134.png">仅有零解的充分必要条件是（）
①
<imgwidth="18"height="18"v:shapes="_x0000_i1109"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image130.png">的行向量组线性无关
②
<imgwidth="18"height="18"v:shapes="_x0000_i1110"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image130.png">的行向量组线性相关
③
<imgwidth="18"height="18"v:shapes="_x0000_i1111"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image130.png">的列向量组线性无关
④
<imgwidth="18"height="18"v:shapes="_x0000_i1112"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image130.png">的列向量组线性相关
【单选题】
已知方阵<imgwidth="126"height="84"v:shapes="_x0000_i1154"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image145.png">相似于对角阵，则常数<imgwidth="30"height="16"v:shapes="_x0000_i1155"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image147.png">（）
①
<imgwidth="14"height="20"v:shapes="_x0000_i1156"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image149.png">
②
<imgwidth="10"height="18"v:shapes="_x0000_i1157"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image151.png">
③
<imgwidth="14"height="18"v:shapes="_x0000_i1158"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image153.png">
④
<imgwidth="24"height="18"v:shapes="_x0000_i1159"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image155.png">
【单选题】
设随机变量<imgwidth="110"height="25"v:shapes="_x0000_i1125"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image167.png">为独立同分布序列，且<imgwidth="92"height="25"v:shapes="_x0000_i1126"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image169.png">服从参数为<imgwidth="15"height="19"v:shapes="_x0000_i1127"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image171.png">的指数分布，则下面式子中正确的是（）
①
<imgwidth="173"height="90"v:shapes="_x0000_i1128"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image173.png">
②
<imgwidth="191"height="90"v:shapes="_x0000_i1129"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image175.png">
③
<imgwidth="192"height="90"v:shapes="_x0000_i1130"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image177.png">
④
<imgwidth="192"height="90"v:shapes="_x0000_i1131"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image179.png">
【单选题】
设<imgwidth="75"height="22"v:shapes="_x0000_i1220"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image314.png">是来自正态总体<imgwidth="60"height="22"v:shapes="_x0000_i1221"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image290.png">的样本，则<imgwidth="98"height="40"v:shapes="_x0000_i1222"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image316.png">服从的分布为（）
①
<imgwidth="37"height="22"v:shapes="_x0000_i1223"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image318.png">
②
<imgwidth="58"height="22"v:shapes="_x0000_i1224"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image320.png">
③
<imgwidth="63"height="40"v:shapes="_x0000_i1225"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image321.png">
④
<imgwidth="63"height="40"v:shapes="_x0000_i1226"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image321.png">
【单选题】
设矩阵<imgwidth="150"height="114"v:shapes="_x0000_i1054"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image038.png">，假设4维列向量组<imgwidth="94"height="26"v:shapes="_x0000_i1055"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image040.png">线性无关，则向量组<imgwidth="142"height="26"v:shapes="_x0000_i1056"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image042.png">的秩为（）
①
<imgwidth="10"height="18"v:shapes="_x0000_i1057"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image044.png">
②
<imgwidth="14"height="18"v:shapes="_x0000_i1058"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image046.png">
③
<imgwidth="14"height="20"v:shapes="_x0000_i1059"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image048.png">
④
<imgwidth="14"height="18"v:shapes="_x0000_i1060"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image050.png">
【单选题】
设<imgwidth="226"height="84"v:shapes="_x0000_i1188"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image228.png">，则线三条直线<imgwidth="142"height="84"v:shapes="_x0000_i1189"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image230.png"><imgwidth="28"height="26"v:shapes="_x0000_i1190"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image232.png"><imgwidth="184"height="30"v:shapes="_x0000_i1191"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image234.png">交于一点的充要条件是（）
①
<imgwidth="70"height="26"v:shapes="_x0000_i1192"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image226.png">线性相关
②
<imgwidth="70"height="26"v:shapes="_x0000_i1193"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image226.png">线性无关
③
秩<imgwidth="98"height="28"v:shapes="_x0000_i1194"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image236.png">秩<imgwidth="62"height="28"v:shapes="_x0000_i1195"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image238.png">
④
<imgwidth="70"height="26"v:shapes="_x0000_i1196"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image226.png">线性相关，<imgwidth="46"height="26"v:shapes="_x0000_i1197"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image240.png">线性无关
【单选题】
若二次型<imgwidth="394"height="28"v:shapes="_x0000_i1252"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image259.png">为正定二次型，则<imgwidth="16"height="20"v:shapes="_x0000_i1253"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image261.png">的取值范围为（）
①
<imgwidth="80"height="48"v:shapes="_x0000_i1254"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image263.png">
②
<imgwidth="66"height="48"v:shapes="_x0000_i1255"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image265.png">
③
<imgwidth="54"height="48"v:shapes="_x0000_i1256"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image267.png">
④
<imgwidth="94"height="48"v:shapes="_x0000_i1257"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image269.png">
【单选题】
设某钢珠直径<imgwidth="14"height="14"v:shapes="_x0000_i1251"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image322.png">服从正态分布<imgwidth="49"height="18"v:shapes="_x0000_i1252"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image324.png">，（单位：mm），其中<imgwidth="12"height="18"v:shapes="_x0000_i1253"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image276.png">为未知参数，从刚生产出的一大堆钢珠中随机抽出9个，求得样本均值<imgwidth="122"height="49"v:shapes="_x0000_i1254"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image326.png">，样本方差<imgwidth="170"height="40"v:shapes="_x0000_i1255"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image328.png">。则<imgwidth="12"height="18"v:shapes="_x0000_i1256"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image276.png">的极大似然估计值为（）
①
31.06
②
<imgwidth="176"height="20"v:shapes="_x0000_i1257"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image330.png">
③
0.98
④
<imgwidth="58"height="20"v:shapes="_x0000_i1258"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image332.png">
