题目内容
求未知数x.
| ①6×3-1.8x=7.2 | ②
|
①6×3-1.8x=7.2,
18-1.8x=7.2,
18-1.8x+1.8x=7.2+1.8x,
7.2+1.8x=18,
7.2+1.8x-7.2=18-7.2,
1.8x=10.8,
1.8x÷1.8=10.8÷18,
x=0.6;
②
=
,
3.5x=2.8,
3.5x÷3.5=2.8÷3.5,
x=0.8.
18-1.8x=7.2,
18-1.8x+1.8x=7.2+1.8x,
7.2+1.8x=18,
7.2+1.8x-7.2=18-7.2,
1.8x=10.8,
1.8x÷1.8=10.8÷18,
x=0.6;
②
| x |
| 0.7 |
| 4 |
| 3.5 |
3.5x=2.8,
3.5x÷3.5=2.8÷3.5,
x=0.8.
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