A.f(x)g(x)>f(b)g(b) | B.f(x)g(a)>f(a)g(x) | C.f(x)g(b)>f(b)g(x) | D.f(x)g(x)>f(a)g(a) |
f(x) |
g(x) |
f′(x)g(x)-f(x)g′(x) |
[g(x)]2 |
f(a) |
g(a) |
f(x) |
g(x) |
f(b) |
g(b) |
1 |
3 |
A.(-∞,-1]∪[1,+∞) | B.(-∞,-2]∪[2,+∞) | C.(-∞,-3]∪[3,+∞) | D.(-∞,-4]∪[4,+∞) |
A.m>
| B.m<1 | C.m≤
| D.m≥
|
f′(x) |
3(x-2) |
A.[-1,+∞) | B.(-∞,-1] | C.[1,+∞) | D.(-∞,1] |
1 |
2 |
3b-2 |
3a+2 |
A.[
| B.(
| C.(-
| D.(2,+∞) |
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