ax+b |
1+x2 |
1 |
2 |
2 |
5 |
ax+b |
1+x2 |
1 |
2 |
2 |
5 |
| ||
1+
|
2 |
5 |
x |
1+x2 |
x1 | ||
1+
|
x2 | ||
1+
|
(x1-x2)(1-x1x2) | ||||
(1+
|
1+
| ||
2 |
-1+
| ||
2 |
|
-1+
| ||
2 |
-1+
| ||
2 |
b |
x |
|
|
m |
2 |
x2+2x+3 |
x |
|
A.-4 | B.4 | C.-1 |
1 |
2 |
A.奇函数且在(0,+∞)上是增函数 |
B.偶函数且在(0,+∞)上是增函数 |
C.函数且在(0,+∞)上是减函数 |
D.偶函数且在(0,+∞)上是减函数 |
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