题目内容
解方程
3.8:1.9=
14.4÷(7.2-X)=3.6.
3.8:1.9=
| X |
| 0.1 |
(1)3.8:1.9=
,
1.9x=3.8×0.1,
1.9x÷1.9=0.38÷1.9,
x=0.2,
(2)14.4÷(7.2-X)=3.6,
14.4÷(7.2-x)×(7.2-x)=3.6×(7.2-x),
14.4=3.6×7.2-3.6x,
14.4+3.6x=25.92-3.6x+3.6x,
14.4+3.6x-14.4=25.92-14.4,
3.6x=11.52,
3.6x÷3.6=11.52÷3.6,
x=3.2.
| x |
| 0.1 |
1.9x=3.8×0.1,
1.9x÷1.9=0.38÷1.9,
x=0.2,
(2)14.4÷(7.2-X)=3.6,
14.4÷(7.2-x)×(7.2-x)=3.6×(7.2-x),
14.4=3.6×7.2-3.6x,
14.4+3.6x=25.92-3.6x+3.6x,
14.4+3.6x-14.4=25.92-14.4,
3.6x=11.52,
3.6x÷3.6=11.52÷3.6,
x=3.2.
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