a |
a-b |
b |
b-a |
1 |
x+2 |
x2+2x+1 |
x+2 |
x2-1 |
x-1 |
a |
a-b |
b |
a-b |
a-b |
a-b |
1 |
x+2 |
(x+1)2 |
x+2 |
1 |
x+1 |
1 |
x+2 |
x+1 |
x+2 |
x |
x+2 |
1 |
x+1 |
x+3 |
x2-1 |
12 |
5 |
6 |
5 |
a-b |
a+3b |
a2-b2 |
a2+6ab+9b2 |
b |
a+b |
x2+2xy+y2 |
x2+xy |
1 |
x |
m2-4 |
m-2 |
m-3 |
m2-3m |
A.-1 | B.3 | C.-1或3 | D.-
|
2011 |
18 |
1 |
4 |
2 |
a+1 |
a+2 |
a2-1 |
a |
a-1 |
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