1 |
x-2 |
1 |
x-2 |
x-2 |
x-2 |
1 |
x-2 |
1 |
x-2 |
x |
(x-2)2 |
a2 |
b |
b2 |
a |
b |
a |
m |
m-n |
n |
m+n |
2mn |
m2-n2 |
1 |
x |
1 |
y |
A.x-y | B.x+y | C.y-x | D.-x-y |
-a |
b |
2a2 |
5b |
a |
5b |
x |
x+1 |
x2 |
x2-1 |
1 |
a+b |
3a |
4b2 |
m2 |
2n |
1 |
mn |
m2 |
2n2 |
a |
b |
a |
b |
a |
b |
a2 |
b2 |
A.0个 | B.1个 | C.2个 | D.3个 |
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