x+2 |
x2-2x |
x-1 |
x2-4x+4 |
x2-16 |
x2+4x |
2 |
x+2 |
x(x-2) |
x-1 |
(x-2)2 |
x(x+4) |
(x+4)(x-4) |
x-4 |
x(x-2)2 |
x |
x-4 |
1 |
(x-2)2 |
2 |
1 |
2 |
a |
a-1 |
1 |
a+1 |
1 |
a2-1 |
3 |
x-2 |
2 |
x+2 |
5x2+2x |
x2-4 |
| ||
3 |
3 |
a-1 |
a-2 |
a2-2a+1 |
2 |
1 |
x-1 |
x |
x2-1 |
1 |
a |
1 |
b |
1 |
a+b |
a |
b |
b |
a |
A.
| B.-
| C.±
| D.无法确定 |
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