x2-1 |
x+1 |
A.x=1 | B.x=-1 | C.x=±1 | D.无法确定 |
x2-1 |
x+1 |
2+x2 |
x-1 |
A.x=-1 | B.x=0 | C.x=1 | D.一切实数 |
1 |
x2+x |
A.x≠0且x≠-1 | B.x≠-1 | C.x≠0 | D.x≠0或x≠-1 |
1 |
x-2 |
A.x=2 | B.x≠2 | C.x≠-2 | D.x>2 |
3 |
2 |
4 |
x-y |
x2+1 |
π |
7 |
8 |
5b |
3a |
A.1个 | B.2个 | C.3个 | D.4个 |
x |
y |
1 |
2 |
x-y |
x+y |
A.
| B.-
| C.3 | D.-3 |
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