A.af(a)<bf(b) | B.bf(a)<af(b) | C.af(b)<bf(a) | D.bf(b)<af(a) |
f(x) |
x |
1 |
x2 |
f(b) |
b |
f(a) |
a |
A.f(x)=cosx | B.f(x)=x2-x | C.f(x)=(
| D.f(x)=3x-2 |
A.k≤-3或-1≤k≤1或k≥3 | B.-3<k<-1或1<k<3 |
C.-2<k<2 | D.不存在这样的实数k |
1 |
2 |
A.[-1,+∞) | B.(-1,+∞) | C.(-∞,-1] | D.(-∞,-1) |
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