A.
| B.1÷
| ||||||||
C.3a-1=
| D.
|
b |
a-b |
a |
b-a |
b+a |
a-b |
b |
a |
a |
b |
a |
b |
a |
b |
a2 |
b2 |
3 |
a |
1 |
(a+b)2 |
a2-b2 |
a-b |
1 |
(a+b)2 |
(a+b)(a-b) |
a-b |
1 |
a+b |
2x |
x-3 |
x |
x+3 |
x2-9 |
x2 |
2 |
7 |
a+3 |
a-4 |
2a+6 |
a+b |
ab |
a |
b |
b |
a |
1 |
3 |
1 |
2 |
2 |
x+1 |
x2-x |
x |
x2-2x+1 |
1 |
x |
x2-2x |
x2-1 |
2x-1 |
x+1 |
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