6x+6 |
x2-1 |
6x+6 |
x2-1 |
6(x+1) |
(x+1)(x-1) |
6 |
x-1 |
6 |
x-1 |
5x |
x-5 |
|x|-2 |
x+2 |
A.2 | B.-2 | C.2或-2 | D.2或3 |
3x |
x-y |
2ab |
a2-b2 |
3a+2 |
a-b |
-2ab |
(a+b)(a-b) |
A.①③④ | B.②③ | C.②④ | D.①③ |
a-b |
2 |
x+3 |
x |
5+y |
π |
x2+1 | ||
|
a+b |
a-b |
1 |
m |
A.1 | B.2 | C.3 | D.4 |
6-7x |
2x2+5 |
A.x<
| B.x>
| C.x<0 | D.不能确定的 |
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