3 |
2 |
4 |
x-y |
x2+1 |
π |
7 |
8 |
1 |
a |
A.1个 | B.2个 | C.3个 | D.4个 |
3 |
2 |
x2+1 |
π |
1 |
8 |
4 |
x-y |
1 |
a |
-x2-3 |
4x+9 |
A.x>-
| B.-
| C.x<-
| D.x<-
|
1 |
x-2 |
A.x≠2 | B.x≠-2 | C.x=2 | D.x=-2 |
3 |
x-1 |
1 |
5 |
4x |
π-3 |
x2-y2 |
2 |
5x2 |
x |
A.1个 | B.2个 | C.3个 | D.4个 |
x2 |
x2+x |
|x|-5 |
(x-1)(x-5) |
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