题目内容
求未知数x.
(1)1.4×3+7x=5.6
(2)
:
=
:x.
(1)1.4×3+7x=5.6
(2)
| 1 |
| 3 |
| 1 |
| 20 |
| 5 |
| 9 |
(1)1.4×3+7x=5.6,
4.2+7x=5.6,
4.2+7x-4.2=5.6-4.2,
7x=1.4,
7x÷7=1.4÷7,
x=0.2;
(2)
:
=
:x,
x=
×
,
x=
,
x×3=
×3,
x=
.
4.2+7x=5.6,
4.2+7x-4.2=5.6-4.2,
7x=1.4,
7x÷7=1.4÷7,
x=0.2;
(2)
| 1 |
| 3 |
| 1 |
| 20 |
| 5 |
| 9 |
| 1 |
| 3 |
| 1 |
| 20 |
| 5 |
| 9 |
| 1 |
| 3 |
| 1 |
| 36 |
| 1 |
| 3 |
| 1 |
| 36 |
x=
| 1 |
| 12 |
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