A.(0,
| B.(-∞,e) | C.(
| D.(-∞,
|
1 |
e |
1 |
e |
A.af(b)>bf(a) | B.af(a)>bf(b) | C.af(a)<bf(b) | D.af(b)<bf(a) |
A.f(x)>0 | B.f(x)<0 | C.f(x)=0 | D.不能确定 |
1 |
3 |
A.b<-1或b>2 | B.b≤-1或b≥2 | C.-2<b<1 | D.-1≤b<2 |
A.(-∞,-
| B.(-∞,-
| C.(-
| D.(-∞,
|
A.-3≤a≤6 | B.-3<a<6 | C.a<-3或a>6 | D.a≤-3或a≥6 |
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