2x2-4x |
x+2 |
x2+2x |
x2-4x+4 |
4x |
2-x |
2x(x-2) |
x+2 |
x(x+2) |
(x-2)2 |
4x |
x-2 |
2x2 |
x-2 |
4x |
x-2 |
2x(x-2) |
x-2 |
2 |
x-2 |
1 |
x2-4 |
2 |
a+1 |
a-1 |
a2+1 |
a2-2a+1 |
1 |
a-1 |
A.1和2 | B.2和3 | C.a>1 | D.a>2 |
x3-x2 |
x2-x |
1-x2 |
x+1 |
2 |
a2-1 |
1 |
a2-a |
x+3 |
x-3 |
x+3 |
x2-3x |
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