a |
b |
b |
a |
a+b |
a |
A.
| B.
| C.
| D.
|
a |
b |
b |
a |
a+b |
a |
a2-b2 |
ab |
a |
a+b |
a-b |
b |
3x |
x-2 |
x |
x+2 |
x |
x2-4 |
a2 |
b |
b2 |
a |
b |
a |
x-1 |
x2-4x+4 |
x2-4 |
x2-1 |
a |
a-b |
(a2+ab)(a-5b) |
(a-b)(a2-5ab) |
x-2 |
x+2 |
4x |
x2-4 |
1 |
x2-4 |
3x |
x-2 |
x |
x+2 |
x |
x2-4 |
1 |
x+2 |
x2+2x+1 |
x2-4 |
b |
a |
a |
b |
a-1 |
a |
a |
a+2 |
1 |
a2+2a |
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