A.恒大于等于0 | B.恒小于0 |
C.恒大于0 | D.和0的大小关系不确定 |
x4f(2x) |
ex |
[x4f(2x)]′ex-x4f(2x)⋅[ex]′ |
[ex]2 |
4x3f(2x)+2x4f′(2x)-x4f(2x) |
ex |
(4x3-x4)f(2x)+2x4f′(2x) |
ex |
x3[(4-x)f(2x)+2f′(2x)] |
ex |
x4f(2x) |
ex |
x4f(2x) |
ex |
A.f′(x)=4πx | B.f′(x)=4π2x | C.f′(x)=8π2x | D.f′(x)=16πx |
A.f(x)=x2+8x | B.f(x)=x2-8x | C.f(x)=x2+2x | D.f(x)=x2-2x |
A.
| B.1 | C.-1 | D.0 |
x+1 |
x |
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