1 |
e |
A.(x1-x2)[f(x1)-f(x2)]<0 | B.f(
| ||||
C.x1f(x2)>x2f(x1) | D.x2f(x2)>x1f(x1) |
1 |
e |
x1+x2 |
2 |
f(x1)+f(x2) |
2 |
1 |
e |
f(x) |
x |
f′(x)x-f(x) |
x2 |
1-lnx |
x2 |
f(x) |
x |
f(x2) |
x2 |
f(x1) |
x1 |
1 |
2 |
| ||
2 |
A.
| B.-
| C.2 | D.-2 |
1 |
8 |
2 |
3 |
|
A.(-∞,-1)∪[0,3) | B.(-∞,-1]∪[0,3] | C.(-∞,-1)(0,3) | D.(-∞,3) |
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