题目内容
解方程
| 8x-3x=0.75 | 10-0.24x=6.4 | 20%x+3x=160. |
(1)8x-3x=0.75,
5x=0.75,
5x÷5=0.75÷5,
x=0.15;
(2)10-0.24x=6.4,
10-0.24x+0.24x=6.4+0.24x,
10-6.4=6.4+0.24x-6.4,
3.6=0.24x,
3.6÷0.24=0.24x÷0.24,
x=15;
(3)20%x+3x=160,
3.2x=160,
3.2x÷3.2=160÷3.2,
x=50.
5x=0.75,
5x÷5=0.75÷5,
x=0.15;
(2)10-0.24x=6.4,
10-0.24x+0.24x=6.4+0.24x,
10-6.4=6.4+0.24x-6.4,
3.6=0.24x,
3.6÷0.24=0.24x÷0.24,
x=15;
(3)20%x+3x=160,
3.2x=160,
3.2x÷3.2=160÷3.2,
x=50.
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