a2-b2 |
a2-ab |
2ab+b2 |
a |
(a+b)(a-b) |
a(a-b) |
a2+2ab+b2 |
a |
a+b |
a |
a |
(a+b)2 |
1 |
a+b |
1 |
2-3 |
b2 |
b-a |
a2 |
a-b |
1 |
a-2 |
1 |
a |
a-2 |
2 |
x2+x-6 |
x-2 |
x+3 |
x2-3x+1 |
A.-1 | B.5 | C.-1或5 | D.-
|
2 |
x+3 |
2 |
3-x |
2x+18 |
x2-9 |
A.2个 | B.3个 | C.4个 | D.5个 |
b+c |
|a| |
a+c |
|b| |
a+b |
|c| |
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