x+1 |
x-1 |
x-1 |
x+1 |
2x+a+2 |
x2-1 |
x+1 |
x-1 |
x-1 |
x+1 |
2x+a+2 |
x2-1 |
1 |
4 |
x+1 |
x-1 |
x-1 |
x+1 |
2x+a+2 |
x2-1 |
x+1 |
x-1 |
x-1 |
x+1 |
2x+a+2 |
x2-1 |
1 |
x(x-1) |
1 |
x(x+1) |
1 |
(x+1)(x+2) |
1 |
(x+9)(x+10) |
1 |
12 |
2 |
x |
1 |
x2 |
1 |
x2+x |
1 |
x2+3x+2 |
1 |
x2+5x+6 |
1 |
x2+7x+12 |
4 |
21 |
3 |
x2+3x-7 |
A.60 | B.一60 | C.10 | D.一10 |
x |
x-1 |
k |
x2-1 |
x |
x+1 |
A.2 | B.1 | C.不为2或一2 | D.无法确定 |
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