x |
x-1 |
A.1 | B.-1 | C.±1 | D.0 |
x |
x-1 |
x2+1 |
x-1 |
x+2 |
(x+3)(x-4) |
A.x≠-3 | B.x≠4 | C.x≠-3或x≠4 | D.x≠-3且x≠-4 |
2x |
5x-1 |
A.形如
| ||
B.分母不等于零的分式有意义 | ||
C.若一个分式的值等于零,则这个分式无意义 | ||
D.分子等于零的分式有意义 |
4 |
a |
a |
4 |
2xy |
π |
5 |
6+x |
x |
7 |
y |
8 |
1 |
x |
1 |
y |
A.2 | B.3 | C.4 | D.5 |
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