2 |
x |
2 |
x |
2 |
x |
2 |
2 |
2 |
x |
2 |
a |
2 |
2 |
a |
2 |
2 |
4 |
a |
2 |
4 |
a2 |
2 |
4 |
a |
2 |
4 |
a2 |
a2+
| ||||
2a+
|
a4+4-4a2 | ||
2a3+4a-4
|
1 |
2a |
(a2 -2)2 | ||
(a-
|
1 |
2a |
a2 -2 | ||
a-
|
1 |
2a |
2 |
a |
2 |
1 |
a |
2 |
a |
2 |
1 |
a |
2 |
2 |
a |
2 |
1 |
a |
2 |
2 |
2 |
2 |
2 |
2 |
2 |
2 |
2 |
2 |
|
7 |
2 |
1 |
2 |
A.
| B.x>2 | ||||
C.x>2或
| D.
|
A.是偶函数,且在(-∞,+∞)上是减函数 |
B.是偶函数,且在(-∞,+∞)上是增函数 |
C.是奇函数,且在(-∞,+∞)上是减函数 |
D.是奇函数,且在(-∞,+∞)上是增函数 |
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