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解方程(1)x÷15+0.4=x÷12-0.1(2)150.5-4x+0.5x=7.
题目详情
解方程 (1)x÷15+0.4=x÷12-0.1 | (2)150.5-4x+0.5x=7. |
▼优质解答
答案和解析
(1)x÷15+0.4=x÷12-0.1,
x+0.4=
x-0.1,
x+0.4-
x=
x-0.1-
x,
0.4+0.1=
x-0.1+0.1,
0.5×60=
x×60,
x=30;
(2)150.5-4x+0.5x=7,
150.5-3.5x=7,
150.5-3.5x+3.5x=7+3.5x,
150.5-7=7+3.5x-7,
143.5÷3.5=3.5x÷3.5,
x=41.
1 |
15 |
1 |
12 |
1 |
15 |
1 |
15 |
1 |
12 |
1 |
15 |
0.4+0.1=
1 |
60 |
0.5×60=
1 |
60 |
x=30;
(2)150.5-4x+0.5x=7,
150.5-3.5x=7,
150.5-3.5x+3.5x=7+3.5x,
150.5-7=7+3.5x-7,
143.5÷3.5=3.5x÷3.5,
x=41.
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