2x-3 |
x+1 |
x+14 |
2x-3 |
x+1 |
x+14 |
4+14 |
18 |
2 |
2 |
5a+b | 3a-b |
4-a | 7a+b |
4a+3b |
b+1 | 2a-b+8 |
A.0 | B.8 | C.4 | D.2 |
2 |
5 |
4x+1 |
6x-1 |
A.1 | B.0 | C.-1 | D.1或-1 |
2b-4 |
11-b |
A.4 | B.5 | C.6 | D.不能确定 |
2a | a+b |
2b-a |
A.a=1,b=2 | B.a=1,b=-1 | C.a=-1,b=2 | D.a=2,b=1 |
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