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全国硕士研究生招生考试《数学三》全真模拟卷二
单选
设{xn}为数列，则下列结论正确的是 ①若{arctanxn}收敛，则{xn}收敛． ②若{arctanxn}单调，则{xn}收敛． ③若xn∈[-1，1]，且
A ①②． B ③④． C ①③． D ②④．
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单选
A f(x)，g(x)，h(x) B h(x)，f(x)，g(x) C f(x)，h(x)，g(x) D h(x)，g(x)，f(x)
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单选
A I<sub>1</sub><I<sub>2</sub><I<sub>3</sub>． B I<sub>2</sub><I<sub>3</sub><I<sub>1</sub>． C I<sub>3</sub><I<sub>2</sub><I<sub>1</sub>． D I<sub>1</sub><I<sub>3</sub><I<sub>2</sub>．
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单选
A <img width="453" height="33" src="https://www.beizhujiaoyu.com/uploads/202208/20220506144624_5390.jpg" /> B <img width="439" height="33" src="https://www.beizhujiaoyu.com/uploads/202208/20220506144626_1484.jpg" /> C <img width="453" height="33" src="https://www.beizhujiaoyu.com/uploads/202208/20220506144626_7901.jpg" /> D <img width="439" height="33" src="https://www.beizhujiaoyu.com/uploads/202208/20220506144628_3516.jpg" />
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单选
A <img width="67" height="27" src="https://www.beizhujiaoyu.com/uploads/202208/20220506144528_9141.jpg" /> B <img width="68" height="27" src="https://www.beizhujiaoyu.com/uploads/202208/20220506144530_6641.jpg" /> C <img width="67" height="27" src="https://www.beizhujiaoyu.com/uploads/202208/20220506144531_0703.jpg" /> D <img width="66" height="27" src="https://www.beizhujiaoyu.com/uploads/202208/20220506144533_1953.jpg" />
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单选
设A是m×n矩阵，则非齐次线性方程组Ax=b有解的充分必要条件是()
A r(A)=r(A<sup>T</sup>)=m． B r(A)=r(A<sup>T</sup>)=n． C <img src="https://www.beizhujiaoyu.com/uploads/202208/165166681533461.png" width="159" height="45" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/165166681972211.png" width="218" height="45" />
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单选
已知α1，α2，α3，α4是4维非零列向量组，A=(α1，α2，α3，α4)，若(1，0，1，0)T为齐次线性方程组Ax=0的一个基础解系，则齐次线性方程组A*
A α<sub>2</sub>，α<sub>4</sub>． B α<sub>1</sub>，α<sub>2</sub>，α<sub>3</sub>. C α<sub>1</sub>，α<sub>3</sub>，α<sub>4</sub>． D α<sub>2</sub>，α<sub>3</sub>，α<sub>4</sub>．
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单选
设二维随机变量(X，Y)的概率分布为 若E(X)=E(Y)，则Coy(X，Y)=
A <img width="31" height="25" src="https://www.beizhujiaoyu.com/uploads/202208/20220506153030_8988.jpg" /> B 0． C <img width="18" height="25" src="https://www.beizhujiaoyu.com/uploads/202208/20220506153031_5706.jpg" /> D <img width="16" height="25" src="https://www.beizhujiaoyu.com/uploads/202208/20220506153033_2581.jpg" />
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单选
设X～N(1，9)，Y～N(1，16)且X，Y相互独立，则D(|X—Y|)=
A 25． B <img width="71" height="27" src="https://www.beizhujiaoyu.com/uploads/202208/20220506145003_6731.jpg" /> C <img width="18" height="27" src="https://www.beizhujiaoyu.com/uploads/202208/20220506145005_6175.jpg" /> D <img width="72" height="27" src="https://www.beizhujiaoyu.com/uploads/202208/20220506145005_8363.jpg" />
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A <img width="59" height="25" src="https://www.beizhujiaoyu.com/uploads/202208/20220506153149_5863.jpg" /> B <img width="82" height="27" src="https://www.beizhujiaoyu.com/uploads/202208/20220506153149_9457.jpg" /> C <img width="30" height="26" src="https://www.beizhujiaoyu.com/uploads/202208/20220506153151_8676.jpg" /> D <img width="33" height="26" src="https://www.beizhujiaoyu.com/uploads/202208/20220506153152_1175.jpg" />
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