2 |
x |
1 |
2x |
1 |
4 |
1 |
5+a |
m-n |
5 |
5y2 |
2y |
A.①④⑥ | B.①②⑤ | C.①②④⑥ | D.③⑤ |
1 |
4 |
m-n |
5 |
2 |
x |
1 |
2x |
1 |
5+a |
5y2 |
2y |
| ||
2x-1 |
| ||
x-1 |
A.
| ||
B.
| ||
C.若分式
| ||
D.当分式的分子为0而分母不为0时,分式的值为0 |
(x+1)(x-2) |
x2-1 |
(x+1)(x-2) |
x2-1 |
3 |
a+2 |
| ||
5-x |
1 |
x+1 |
A.x>1 | B.x≠1 | C.x≠-1 | D.x≠0 |
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