解方程(1)x÷15+0.4=x÷12-0.1 &
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解方程 (1)x÷15+0.4=x÷12-0.1 | (2)150.5-4x+0.5x=7. |
![解方程(1)x÷15+0.4=x÷12-0.1 &](/uploads/image/z/5665889-65-9.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%881%EF%BC%89x%C3%B715%2B0.4%3Dx%C3%B712-0.1%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26)
(1)x÷15+0.4=x÷12-0.1,
1
15x+0.4=
1
12x-0.1,
1
15x+0.4-
1
15x=
1
12x-0.1-
1
15x,
0.4+0.1=
1
60x-0.1+0.1,
0.5×60=
1
60x×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
15x+0.4=
1
12x-0.1,
1
15x+0.4-
1
15x=
1
12x-0.1-
1
15x,
0.4+0.1=
1
60x-0.1+0.1,
0.5×60=
1
60x×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.