4 |
a+2 |
a2-4+4 |
a+2 |
a2 |
a+2 |
A.
| B.
| ||||||||||||
C.
| D.
|
1 |
1×2 |
1 |
2 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
(x-1)x |
1 |
x(x+1) |
1 |
(x+1)(x+2) |
1 |
(x+2006)(x+2007) |
4 |
x2-4 |
1 |
x+2 |
1 |
2-x |
A.A=B | B.A,B互为相反数 |
C.A,B互为倒数 | D.以上结论都不对 |
2x |
x+1 |
1-x |
x+1 |
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