题目内容
| 解方程. 4+0.7x=102 | 75%X-3×0.8=5.1 |
|
(1)4+0.7x=102,
4+0.7x-4=102-4,
0.7x=98,
0.7x÷0.7=98÷0.7,
x=140;
(2)75%X-3×0.8=5.1,
0.75X-2.4=5.1,
0.75X-2.4+2.4=5.1+2.4,
0.75X=7.5,
0.75X÷0.75=7.5÷0.75,
X=10;
(3)
:x=3:12,
3x=12×
,
3x÷3=9÷3,
x=3.
4+0.7x-4=102-4,
0.7x=98,
0.7x÷0.7=98÷0.7,
x=140;
(2)75%X-3×0.8=5.1,
0.75X-2.4=5.1,
0.75X-2.4+2.4=5.1+2.4,
0.75X=7.5,
0.75X÷0.75=7.5÷0.75,
X=10;
(3)
| 3 |
| 4 |
3x=12×
| 3 |
| 4 |
3x÷3=9÷3,
x=3.
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