1 |
a |
2xy |
π |
3a2b3c |
4 |
5 |
6+x |
x |
7 |
y |
8 |
2x |
x |
A.2个 | B.3个 | C.4个 | D.5个 |
1 |
a |
2xy |
π |
3a2b3c |
4 |
5 |
6+x |
x |
7 |
y |
8 |
2x |
x |
1 |
a |
5 |
6+x |
2x |
x |
A.
| B.
| C.
| D.
|
x |
x+1 |
x |
3 |
a |
π |
π |
x |
A.1个 | B.2个 | C.3个 | D.4个 |
A.形如
| ||
B.分母不等于零,分式有意义 | ||
C.分式的值等于零,分式无意义 | ||
D.分子等于零,分式的值就等于零 |
x |
3 |
y |
5 |
x+y |
y |
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