解方程(1)x÷15+0.4=x÷12-0.1 (2)150.5-4x+0.5x=7.
2019-05-28
解方程 (1)x÷15+0.4=x÷12-0.1 | (2)150.5-4x+0.5x=7. |
优质解答
(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)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.