3 |
x-1 |
1 |
x+1 |
x |
x2-1 |
3(x+1)-(x-1) |
(x+1)(x-1) |
x |
(x+1)(x-1) |
2(x+2) |
(x+1)(x-1) |
(x+1)(x-1) |
x |
2(x+2) |
x |
2×(6+2) |
6 |
8 |
3 |
1 |
x-y |
1 |
x+y |
2y |
x2-2xy+y2 |
2 |
2 |
x2-3x |
x-2 |
3 |
2-x |
A.
| B.3 | C.2 | D.4 |
3 |
a2+1 |
2x-3 |
x |
x2-9 |
x |
2 |
x2+2x+1 |
x2-1 |
x |
x-1 |
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