单选
A -2x<sup>2</sup>cosx<sup>4</sup>. B <img width="187" height="43" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222846_2105.jpg" /> C <img width="190" height="44" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222847_2886.jpg" /> D <img width="86" height="43" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222848_3199.jpg" />
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单选
A 0. B 1. C 2. D <img width="24" height="36" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222850_4292.jpg" />
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单选
设函数f(x)可导,F(x)=f(x)(1+|sinx|),则f(0)=0是F(x)在x=0处可导的( )
A 充分必要条件. B 充分条件但非必要条件. C 必要条件但非充分条件. D 既非充分又非必要条件.
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A 2x-2. B 2x+2. C x-1. D x+1.
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A 1. B x<sup>2</sup>. C e<sup>x</sup>. D 2x.
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A 0. B <img width="23" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222854_6636.jpg" /> C 1. D <img width="24" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222855_7818.jpg" />
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A <img width="24" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222857_8980.jpg" /> B <img width="24" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222858_8845.jpg" /> C <img width="23" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222900_0084.jpg" /> D <img width="23" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222900_9917.jpg" />
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单选
设随机变量X~N(2,9),且P{X≥c}=P{X
A 1. B 2. C 3. D 4.
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单选
已知A=(α,γ2,γ3,γ4),B=(β,γ2,γ3,γ4)为四阶方阵,其中α,β,γ2,γ3,γ4均为四维列向量,且已知行列式|A|=4,|B|=1,则|A
A 5. B 10. C 20. D 40.
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单选
设向量组α1,α2,α3线性相关,α1,α2,α4线性无关,则有(  )
A α<sub>1</sub>必可由α<sub>2</sub>,α<sub>3</sub>,α<sub>4</sub>线性表示. B α<sub>2</sub>必可由α<sub>1</sub>,α<sub>3</sub>,α<sub>4</sub>线性表示. C α<sub>3</sub>必可由α<sub>1</sub>,α<sub>2</sub>,α<sub>4</sub>线性表示. D α<sub>4</sub>必可由α<sub>1</sub>,α<sub>2</sub>,α<sub>3</sub>线性表示.
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