題目列表(包括答案和解析)
2x |
x+2 |
3 |
x-2 |
3 |
x |
6 |
x-1 |
7 |
x2-x |
x+1 |
x |
5x |
x+1 |
x-2 |
x+2 |
16 |
x2-4 |
x+2 |
x-2 |
1 |
x+3 |
2 |
3-x |
12 |
x2-9 |
1 |
x-2 |
2x |
2-x |
1 |
x-2 |
x-1 |
2-x |
1 |
x2+3x |
2 |
x2-9 |
1 |
x2-3x |
2 |
x+1 |
x |
x2-1 |
1-x |
2-x |
1 |
x-2 |
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