x |
y |
x2+xy+y2 |
x2-y2 |
x |
y |
x2+xy+y2 |
x2-y2 |
(x+y)2-xy |
(x+y)(x-y) |
9y2-2y•y |
2y•y |
7 |
3 |
7 |
3 |
A.
| B.
| ||||||||
C.
| D.
|
x2-y2 |
x+y |
3y |
15x |
x+1 |
x2+1 |
x(x+1) |
x2+2x+1 |
A.1个 | B.2个 | C.3个 | D.4个 |
x2-2x+1 |
x2-1 |
x-1 |
A |
x |
6ab2 |
y |
9a2bc |
1 |
x2-5x |
2 |
x2-25 |
3 |
x2+5x |
1 |
a |
1 |
b |
a+2ab+b |
a-ab+b |
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