1 |
a |
1 |
b |
1 |
a-b |
a+b |
a |
a-b |
b |
A.7 | B.8 | C.9 | D.10 |
1 |
a |
1 |
b |
1 |
a-b |
a+b |
ab |
1 |
a-b |
a+b |
a |
a-b |
b |
2ab+b2-a2 |
ab |
ab |
ab |
2x2+y2 |
x+y |
x2+2y2 |
x+y |
2 |
2 |
x2-1 |
x2-2x+1 |
1-x |
x+1 |
x |
x-1 |
4 |
a-1 |
3 |
a+1 |
a |
a2-1 |
a2-4 |
a2-4a+4 |
1 |
2-a |
a2 |
a2-2a |
1 |
a |
1 |
b |
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