全国硕士研究生招生考试《数学三》全真模拟卷一

单选

当x→0时，ln(1-2x)+ax+bx2~cx3，则a，b，c的值为

A a=2，b=-2，c=8/3 B a=-2，b=2，c=8/3 C a=2，b=2，c=-8/3 D a=2，b=2，c=8/3

详情

单选

A <img src="https://www.beizhujiaoyu.com/uploads/202208/164983867287301.jpg" alt="" width="60" height="34" title="" align="" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/164983868128881.jpg" alt="" width="60" height="33" title="" align="" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/164983868927801.jpg" alt="" width="80" height="33" title="" align="" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/164983869849501.jpg" alt="" width="80" height="35" title="" align="" />

详情

单选

A I1<I2<I3 B I2<I3<I1 C I3<I2<I1 D I1<I3<I2

详情

单选

A u B uv C 0 D 1

详情

单选

下列说法正确的是( )．

A <img width="200" height="31" src="https://www.beizhujiaoyu.com/uploads/202208/20211031002147_3992.jpg" title="" align="" alt="" /> B <img width="200" height="27" src="https://www.beizhujiaoyu.com/uploads/202208/20211031002149_3367.jpg" title="" align="" alt="" /> C <img width="280" height="35" src="https://www.beizhujiaoyu.com/uploads/202208/20211031002149_5086.jpg" title="" align="" alt="" /> D <img width="300" height="34" src="https://www.beizhujiaoyu.com/uploads/202208/20211031002151_4148.jpg" title="" align="" alt="" />

详情

单选

设A,B均为n阶矩阵，则

A <img src="https://www.beizhujiaoyu.com/uploads/202208/164983090855671.jpg" alt="" width="100" height="41" title="" align="" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/164983092522841.jpg" alt="" width="120" height="40" title="" align="" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/164983094579471.jpg" alt="" width="100" height="41" title="" align="" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/16498309633931.jpg" alt="" width="100" height="40" title="" align="" />

详情

单选

设A为n阶矩阵，对于齐次线性方程组(I)Anx=0和(II)An+1x=0，必有

A (II)的解必是(I)的解，(I)的解也是(II)的解 B (I)的解必是(II)的解，但是(II)的解不是(I)的解 C (II)的解必是(I)的解，但是(I)的解不是(II)的解 D (I)的解不是(I)的解，(II)的解也不是(I)的解

详情

单选

设二维随机变量(X，Y)的概率分布为若X与Y相互独立，则(p，q)=( )．

A <img width="50" height="28" src="https://www.beizhujiaoyu.com/uploads/202208/20220207203021_3039.jpg" title="" align="" alt="" /> B <img width="50" height="28" src="https://www.beizhujiaoyu.com/uploads/202208/20220207203021_7883.jpg" title="" align="" alt="" /> C <img width="50" height="28" src="https://www.beizhujiaoyu.com/uploads/202208/20220207203023_3987.jpg" title="" align="" alt="" /> D <img width="50" height="28" src="https://www.beizhujiaoyu.com/uploads/202208/20220207203023_8508.jpg" title="" align="" alt="" />

详情

单选

设随机变量X的分布函数为F(x)=0.4Φ(0.5x+1)+0.6Φ(x+2)，则D(X)=

A 1.1 B 2.2 C 2 D 4

详情

单选

A 1/3 B 1/6 C 1/9 D 1/81

详情