题目内容
解方程或比例
| 0.378×8-7x=0.2. |
(1)
:x=
:
,
x=
×
,
x×
=
×
×
,
x=19;
(2)0.378×8-7x=0.2,
3.024-7x=0.2,
3.024-7x+7x-0.2=0.2+7x-0.2,
2.824=7x,
7x=2.824,
7x÷7=2.824÷7,
x≈0.4.
| 6 |
| 5 |
| 3 |
| 10 |
| 19 |
| 4 |
| 3 |
| 10 |
| 6 |
| 5 |
| 19 |
| 4 |
| 3 |
| 10 |
| 10 |
| 3 |
| 6 |
| 5 |
| 19 |
| 4 |
| 10 |
| 3 |
x=19;
(2)0.378×8-7x=0.2,
3.024-7x=0.2,
3.024-7x+7x-0.2=0.2+7x-0.2,
2.824=7x,
7x=2.824,
7x÷7=2.824÷7,
x≈0.4.
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