1 |
2 |
2xy |
π |
3 |
x2+y2 |
1 |
3 |
1 |
x-1 |
a |
5 |
1 |
2 |
2xy |
π |
3 |
x2+y2 |
1 |
3 |
1 |
x-1 |
a |
5 |
3 |
x2+y2 |
1 |
x-1 |
x-1 |
x2+1 |
A.1 | B.-1 | C.±1 | D.任意实数 |
1 |
x-2 |
A.x≠1 | B.x≠0 | C.x≠2 | D.x≠3 |
x2-1 |
x-1 |
A.0 | B.1 | C.-1 | D.±1 |
a-b |
2 |
x+3 |
x |
5+y |
π |
x2 |
4 |
a+b |
a-b |
1 |
m |
A.2 | B.3 | C.4 | D.5 |
1 |
a |
a |
x-5 |
2a-1 |
3 |
1 |
5 |
A.1 | B.2 | C.3 | D.4 |
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