a |
b |
b |
a |
a2+b2 |
ab |
A.0 | B.-
| C.-
| D.
|
a |
b |
b |
a |
a2+b2 |
ab |
a2 |
ab |
b2 |
ab |
a2+b2 |
ab |
a2-b2-a2-b2 |
ab |
-2b2 |
ab |
2b |
a |
x |
x-1 |
1 |
1-x |
1 |
2m-4 |
2 |
m2-4 |
m-2 |
m+1 |
2m-1 |
m+1 |
1 |
a-b |
1 |
a+b |
x-3 |
x2-1 |
3 |
1-x |
x-3 |
(x-1)(x+1) |
3 |
x-1 |
x-3 |
(x-1)(x+1) |
3(x+1) |
(x-1)(x+1) |
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