x2 |
x+a |
x2 |
x |
1 |
a-1 |
1 |
1+a |
x2 |
x-1 |
x12 |
x1-1 |
x22 |
x2-1 |
x12x2 -x12-x1x22+x22 |
(x1-1)(x2-1) |
x1x2(x1-x2)-(x1+x2)(x1-x2) |
(x1-1)(x2-1) |
(x1-x2)[x1x2-(x1+x2)] |
(x1-1)(x2-1) |
x1-x2 |
(x1-1)(x2-1) |
ax-1 |
x+1 |
A.1个 | B.2个 | C.3个 | D.0个 |
1 |
x |
x-1 |
x2+5 | ||
|
5 |
2 |
3 |
x |
|
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