1 |
a |
1 |
b |
1 |
a+b |
b |
a |
a |
b |
A.3 | B.-1 | C.2 | D.1 |
1 |
a |
1 |
b |
1 |
a+b |
1 |
a+b |
a+b |
ab |
b |
a |
a |
b |
b2+a2 |
ab |
(a+b) 2-2ab |
ab |
ab-2ab |
ab |
-ab |
ab |
3-x |
x-2 |
5 |
x-2 |
a |
a2-2a |
1 |
3-a |
2-a |
9-a2 |
1 |
x |
1 |
x-1 |
x2-1 |
x |
x |
2y |
x2 |
4y |
x |
x-5 |
x |
5-x |
2x |
x2-25 |
1 |
x-4 |
1 |
x+4 |
3x |
x-1 |
x |
x+1 |
x |
x2-1 |
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