2x |
x2-1 |
1 |
x-3 |
A.x≠3 | B.x≠0 | C.x≠-3 | D.x=±1 |
3x |
2 |
4 |
x-y |
x2+1 |
π |
7 |
8 |
5b |
3a |
A.2个 | B.3个 | C.4个 | D.5个 |
|x|-2 |
x-2 |
A.0 | B.2 | C.-2 | D.±2 |
1 |
a |
20y |
π |
3ab3c |
4 |
5 |
6+x |
x |
7 |
y |
8 |
10 |
y |
A.2 | B.3 | C.4 | D.5 |
1 |
5 |
4x |
π-3 |
x2-y2 |
2 |
1 |
x |
5x2 |
x |
A.2 | B.3 | C.4 | D.5 |
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