f(x2)-f(x1) |
x2-x1 |
A.f(3)<f(-2)<f(1) | B.f(1)<f(-2)<f(3) | C.f(-2)<f(1)<f(3) | D.f(3)<f(1)<f(-2) |
f(x2)-f(x1) |
x2-x1 |
x |
3 |
1 |
2 |
1 |
2010 |
A.
| B.
| C.
| D.
|
a |
1 |
2 |
b |
1 |
x |
a |
b |
A.(1,+∞) | B.(0,+∞) | C.(-∞,-1)和(0,1) | D.(-∞,0)和(0,1) |
A.y=sinx | B.y=-x2 | C.y=e-x | D.y=x3 |
A.(-∞,-1)∪(1,+∞) | B.(-∞,-
| C.(-1,1) | D.(-
|
b |
x |
A.在(-∞,+∞)上是增函数 |
B.在(0,+∞)上是增函数 |
C.在(-∞,+∞)上是减函数 |
D.在(-∞,0)上是增函数,在(0,+∞)上是减函数 |
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