1 |
x-1 |
A.1 | B.-1 |
C.0 | D.不存在这样的a |
1 |
a |
1 |
a |
1 |
a |
2(x-2) |
x+2 |
x+2 |
x-2 |
7 |
y-1 |
y |
y-1 |
A.2 | B.-1 | C.-2 | D.3 |
2 |
x+3 |
3 |
2 |
7 |
2x+6 |
2x2 |
x-1 |
x |
x-y |
2y |
x-y |
xy |
x-2y |
1 |
x |
1 |
y |
3-x |
2x-4 |
5 |
x-2 |
x |
x+2 |
x+2 |
x-2 |
8 |
x2-4 |
5 |
x2+x |
1 |
x2-x |
x |
x-1 |
3 |
(x-1)(x+2) |
1 |
x2 |
1 |
x |
1 |
x |
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