2a |
a2-4 |
1 |
a-2 |
x+1 |
x |
2x2-1 |
2x |
x |
2 |
2a |
(a-2)(a+2) |
a+2 |
(a-2)(a+2) |
a-2 |
(a-2)(a+2) |
1 |
a+2 |
x+1 |
x |
(x-1)(x+1) |
2x |
x+1 |
x |
2x |
(x-1)(x+1) |
2 |
x-1 |
a2-9 |
a2+6a+9 |
a-3 |
a2+3a |
a-a2 |
a-1 |
27-x3 |
|
1 |
x-y |
A.无意义 | B.
| C.
| D.
|
3 |
x2-2x+1 |
x2-1 |
x-3 |
x+1 |
a+2b |
a-b |
b |
b-a |
a+1 |
a+3 |
a+1 |
2 |
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