2 |
x-1 |
1 |
x2-1 |
3 |
2 |
x-1 |
x+1 |
(x+1)(x-1) |
2 |
x-1 |
1 |
x-1 |
1 |
x-1 |
3 |
1 | ||
|
| ||
3 |
A.刚好2kg | B.顾客吃亏了 | C.商店吃亏了 | D.无法确定 |
x+1 |
x2-x |
x |
x2-2x+1 |
1 |
x |
2 |
x-3 |
x+3 |
2x |
x2-9 |
3 |
4-x |
x-2 |
12 |
x-2 |
3 |
x-3 |
2x-4 |
5 |
x-2 |
3 |
x(x-2) |
x2-4 |
x2+4x+4 |
x+2 |
2 |
x2-2x+1 |
x2-1 |
x-1 |
x2+x |
x2 |
x-1 |
2x |
1-x |
x |
x-1 |
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