A.f(x)=-x3 | B.f(x)=x3+1 | ||||
C.f(x)=
| D.f(x)=lg
|
ex+e-x |
2 |
1-x |
1+x |
A.(-∞,-1] | B.[3,+∞) | C.[-1,3] | D.(-∞,-1]∪[3,+∞) |
A.y=(
| B.y=x2 | ||
C.y=x-1 | D.y=logax(a>0且a≠1) |
A.[0,1] | B.[log23,2] | C.[1,log23] | D.[1,2] |
x |
3 |
2 |
2 |
2 |
A.{0,1,2,4} | B.{
| C.{-
| D.{
|
A.(1,2) | B.[1,+∝) | C.(1,+∝) | D.(1,2)∪(2.,+∝) |
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