x2-1 |
x2+3x-10 |
x+5 |
(x+1)2 |
(x+1)(x-1) |
(x+5)(x-2) |
x+5 |
(x+1)2 |
x-1 |
(x-2)(x+1) |
x-1 |
x2-x-2 |
2xy |
(x-y)2 |
x-y |
4y |
x-1 |
x2+3x+2 |
x-1 |
x+2 |
b |
a3 |
bn |
a3n |
b |
a |
bn+2 |
an+2 |
a2 |
b |
a4n |
b2n |
-b |
a |
b2n+3 |
a2n+3 |
A.1个 | B.2个 | C.3个 | D.4个 |
a |
b |
b2 |
2a |
1 |
x2-4x+4 |
x2-4 |
x |
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