1+2x |
1-2x |
2x+1 |
3x-4 |
1+2x |
1-2x |
1 |
2 |
2x+1 |
3x-4 |
4 |
3 |
m |
m-1 |
m-2 |
m+3 |
m2-1 |
m+1 |
x-2 |
3-4x |
2 |
x |
x+y |
5 |
1 |
2-a |
x |
π-1 |
A.①② | B.③④ | C.①③ | D.①②③④ |
x+y |
6 |
y |
x |
x-y |
a+b |
x |
π |
A.1个 | B.2个 | C.3个 | D.4个 |
2 |
x |
x+y |
5 |
1 |
2-a |
x |
π-1 |
A.①② | B.③④ | C.①③ | D.①②③④ |
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