x2-1 |
x-1 |
A.1 | B.-1 | C.1或-1 | D.0 |
x2-1 |
x-1 |
2xy |
π |
3a2b3c |
4 |
5 |
6+x |
10 |
y |
A.4 | B.3 | C.2 | D.1 |
A.
| B.
| C.
| D.2a-4 |
3 |
b-1 |
A.b≠-1 | B.b>1 | C.b<1 | D.b≠1 |
2 |
x |
1 |
3 |
x |
π-3 |
5 |
a-x |
x(x+y) |
x |
x+3 |
(x+1)(x-2) |
A.2个 | B.3个 | C.4个 | D.5个 |
x-3 |
x+3 |
A.-3 | B.3或-3 | C.3 | D.0 |
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