a2-b2 |
a2b-ab2 |
a2+b2 |
2ab |
3 |
11 |
3 |
11 |
a2-b2 |
a2b-ab2 |
a2+b2 |
2ab |
(a+b)(a-b) |
ab(a-b) |
2ab+a2+b2 |
2ab |
2 |
a+b |
3 |
11 |
3 |
11 |
2 | ||
2
|
| ||
3 |
x-3 |
3x2-6x |
5 |
x-2 |
| ||
3 |
x2-3x |
x-2 |
3 |
2-x |
A.
| B.
| C.
| D.
|
x2+6x+9 |
2(x+3) |
x2-3x |
x |
y+1 |
x+1 |
y |
x |
A.0 | B.正数 | C.负数 | D.非负数 |
x-1 |
x |
2x-1 |
x |
5 |
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