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设函数f(x)在x=x0处可导,则f'(x0)=(  )
A <img width="199" height="45" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222802_5073.jpg" /> B <img width="199" height="46" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222803_6324.jpg" /> C <img width="220" height="46" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222804_6323.jpg" /> D <img width="257" height="46" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222805_7417.jpg" />
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A <img width="123" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222807_8678.jpg" /> B x-ln|x|+C. C C-ln|x|. D <img width="159" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222808_8834.jpg" />
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A e<sup>3</sup>. B 2e<sup>3</sup>. C 3e<sup>3</sup>. D 4e<sup>3</sup>.
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A <img width="59" height="42" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222812_1011.jpg" /> B <img width="58" height="42" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222813_1479.jpg" /> C <img width="59" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222814_2104.jpg" /> D <img width="59" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222815_2885.jpg" />
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已知x=1是函数y=x3+ax2的驻点,则常数a=(  )
A 0. B 1. C <img width="30" height="31" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222816_3198.jpg" title="" align="" alt="" /> D <img width="20" height="36" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222817_3980.jpg" title="" align="" alt="" />
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A <img width="24" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222819_5073.jpg" /> B <img width="24" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222820_5698.jpg" /> C <img width="24" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222821_6011.jpg" /> D <img width="23" height="41" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222822_6938.jpg" />
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如下函数中,哪个不能作为随机变量x的分布函数(  )
A <img width="160" height="79" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222823_7417.jpg" title="" align="" alt="" /> B <img width="160" height="78" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222824_8042.jpg" title="" align="" alt="" /> C <img width="160" height="33" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222825_8980.jpg" title="" align="" alt="" /> D <img width="160" height="46" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222826_9321.jpg" title="" align="" alt="" />
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设随机变量X~N(1,1),概率密度为f(x),分布函数为F(x),则下列正确的是(  )
A P{X≤0}=P{X≥0}. B P{X≤1}=P{X≥1}. C f(x)=f(-x),x∈R. D F(x)=1-F(-x),x∈R.
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A <img width="50" height="38" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222829_0386.jpg" title="" align="" alt="" /> B <img width="60" height="35" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222830_1323.jpg" title="" align="" alt="" /> C <img width="60" height="34" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222831_1949.jpg" title="" align="" alt="" /> D <img width="60" height="34" src="https://www.beizhujiaoyu.com/uploads/202208/20211222222832_3198.jpg" title="" align="" alt="" />
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已知AB为3阶方阵,且|A|=-1,|B|=2,则|2(ATB-1)2|=(  )
A -1. B 1. C -2. D 2.
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