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 |
b |
a3 |
bn |
a3n |
b |
a |
bn+2 |
an+2 |
a2 |
b |
a4n |
b2n |
-b |
a |
b2n+3 |
a2n+3 |
a |
b |
b2 |
2a |
1 |
x2-4x+4 |
x2-4 |
x |
4xy |
(x-y)2 |
x-y |
2y |
x2-x-6 |
x2+5x+6 |
x-3 |
x+3 |
x |
y |
y |
x |
1 |
xy |
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