a |
a2-b2 |
1 |
a+b |
b |
b-a |
1 |
27 |
4 |
27 |
4m7 |
27n13 |
a-(a-b) |
(a+b)(a-b) |
-(a-b) |
b |
b |
(a+b)(a-b) |
-(a-b) |
b |
1 |
a+b |
x2-4x+4 |
2x-4 |
m+1 |
1-m2 |
A.2010 | B.-2010 | C.
| D.
|
a-3b |
a-b |
a+b |
a-b |
a-b |
a |
2ab-b2 |
a |
A.甲合算 | B.乙合算 |
C.甲、乙一样合算 | D.无法确定 |
b |
a |
1 |
2 |
2a+b |
2a-b |
4b |
2a-b |
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