x2-4 |
x2-4x+4 |
x2-4 |
x2-4x+4 |
(x+2)(x-2) |
(x-2)2 |
x+2 |
x-2 |
x+2 |
x-2 |
x-1 |
x2-1 |
A.
| B.
| C.
| D.
|
x2-1 |
(x+1)2 |
( ) |
x+1 |
-a |
m-n |
A.
| B.
| C.
| D.-
|
1 |
x-3 |
x+2 |
x2-x-6 |
A.x+2>0 | B.x+2=0 | C.x+2<0 | D.x+2≠0 |
2xy |
x-y |
A.变为原来的2倍 | B.不变 |
C.变为原来的4倍 | D.无法确定 |
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