4 |
a-1 |
3 |
a+1 |
a |
a2-1 |
4(a+1)-3(a-1) |
(a+1)(a-1) |
a |
a2-1 |
a+7 |
(a+1)(a-1) |
(a+1)(a-1) |
a |
a+7 |
a |
-5+7 |
-5 |
2 |
5 |
a2-4 |
a2-4a+4 |
1 |
2-a |
a2 |
a2-2a |
1 |
a |
1 |
b |
1 |
a |
1 |
b |
2 |
a+b |
b |
a |
a |
b |
x2-2xy+y2 |
x2-xy |
x |
y |
y |
x |
3 |
3 |
1 |
a |
1 |
b |
2a+3ab-2b |
a-2ab-b |
A.
| B.-
| C.
| D.1 |
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