A.
| B.
| C.10 | D.3 |
10 |
3 |
A.由2x+4=3x+1,得2x+3x=1+4 | ||||
B.由7(x-1)=2(x+3),得7x-1=2x+3 | ||||
C.由0.5x-0.7=5-1.3x,得5x-7=5-13x | ||||
D.由
|
x |
1×3 |
x |
3×5 |
x |
2007×2009 |
A.2007 | B.2009 | C.4014 | D.4018 |
1 |
2 |
A.0 | B.
| C.-
| D.
|
x-2 |
5 |
2x-5 |
3 |
A.由3+x=5得x=5+3 | B.由7x=-4得x=-
| ||
C.由
| D.由3=x-2得x=2+3 |
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