a2-9 |
a2+6a+9 |
a-3 |
a2+3a |
a-a2 |
a-1 |
(a+3)(a-3) |
(a+3)2 |
a-3 |
a(a+3) |
a(1-a) |
a-1 |
a-3 |
a+3 |
a-3 |
a(a+3) |
a(a-3)+a-3 |
a(a+3) |
a2-2a-3 |
a(a+3) |
2a2+a-3 |
a(a+3) |
2×22+2-3 |
2(2+3) |
7 |
10 |
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 |
3 |
cd |
12 |
1 |
a-1 |
a2+a |
1-a |
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