x2 |
1+x2 |
4 |
5 |
1 |
2 |
1 |
5 |
9 |
10 |
1 |
3 |
1 |
10 |
1 |
x |
1 |
2 |
1 |
3 |
1 |
2010 |
x2 |
1+x2 |
1 |
x |
1 |
x |
x2 |
1+x2 |
| ||
1+
|
|
|
(x1+x2)(x1-x2) | ||||
(1+
|
x2 |
1+x2 |
|
A.(0,1) | B.(0,
| C.[
| D.[
|
A.(0,1) | B.(0,2) | C.(1,2) | D.(2,+∞) |
A.在区间[-2,-1]上是增函数,在区间[3,4]上是增函数 |
B.在区间[-2,-1]上是增函数,在区间[3,4]上是减函数 |
C.在区间[-2,-1]上是减函数,在区间[3,4]上是增函数 |
D.在区间[-2,-1]上是减函数,在区间[3,4]上是减函数 |
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