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( )
A e B 2 C 1 D 0
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若y=1+cosx,则dy=( )
A (1+sinx)dx B (1-sinx)dx C sinxdx D -sinxdx
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若函数ƒ(x)=5x,则ƒ´(x)=( )
A 5<sup>x-1</sup> B x5<sup>x-1</sup> C 5<sup>x</sup>ln5 D 5<sup>x</sup>
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曲线y=x3+2x在点(1,3)处的法线方程是( )
A 5x+y-8=0 B 5x-y-2=0 C x+5y-16=0 D x-5y+14=0
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( )
A ln| 2-x|+C B -ln| 2-x|+C C <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017113204_5563.png" width="94" height="26" />  D <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017113208_4314.png" width="79" height="26" /> 
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( )
A <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017113215_8064.png" width="77" height="25" />  B ƒ(2x)+C C 2ƒ(2x)+C D <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017113220_8220.png" width="70" height="25" /> 
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( )
A 0 B 2 C 2ƒ(-1) D 2ƒ(1)
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( )
A 2xy+3+2y B xy+3+2y C 2xy+3 D xy+3
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设区域D={(x,y)(0≤y≤x2,0≤x≤1),则D绕X轴旋转一周所得旋转体的体积为( )
A <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017113233_5407.png" width="13" height="22" />  B <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017113237_9001.png" width="12" height="22" />  C <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017113242_1345.png" width="12" height="22" />  D π
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设A,B为两个随机事件,且相互独立,P(A)=0.6,P(B)=0.4,则P(A-B)=( )
A 0.24 B 0.36 C 0.4 D 0.6
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