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 |
a |
4 |
2xy |
π |
x |
7 |
y |
8 |
4 |
a |
5 |
6+x |
1 |
x |
1 |
y |
1 |
x+1 |
A.x为任意实数 | B.x≠0 |
C.x≠1 | D.x≠-1 |
2x-1 |
x |
x2-1 |
2x+1 |
5x-2 |
2x+1 |
|x|+3 |
x-3 |
A |
B |
3 |
x-2 |
x-2 |
x+2 |
x2-1 |
x+1 |
|x|-3 |
(x-3)(x+1) |
1 |
x-3 |
2+x |
x2+1 |
x-1 |
x-3 |
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