0.3x-0.2 |
0.2 |
1.5-5x |
0.5 |
A.7+
| B.0.7+
| ||||||||
C.0.7+
| D.0.7+1.5x-1=3-x |
(0.3x-0.2)×10 |
0.2×10 |
(1.5-5x)×10 |
0.5×10 |
3x-2 |
2 |
15-50x |
5 |
A.7 | B.-8 | C.-10 | D.9 |
x+1 |
3 |
3x-2 |
2 |
1 |
3 |
7 |
3 |
A.由
| ||||
B.由7(x-1)=2(x+3),去括号得7x-1=2x+6 | ||||
C.由2x+4=3x+1,移项得2x-3x=1-4 | ||||
D.由-3x=2,系数化为1得 x=-
|
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