题目内容
求未知数x.
| 7x+12×20%=20 | 15+
|
①7x+12×20%=20,
7x+2.4=20,
7x+2.4-2.4=20-2.4,
7x=17.6,
7x×
=17.6×
,
x=
.
②15+
x=1.2x,
15+
x-
x=1.2x-
x,
15=
x,
15×
=
x×
,
x=
.
7x+2.4=20,
7x+2.4-2.4=20-2.4,
7x=17.6,
7x×
| 1 |
| 7 |
| 1 |
| 7 |
x=
| 88 |
| 35 |
②15+
| 1 |
| 2 |
15+
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
15=
| 7 |
| 10 |
15×
| 10 |
| 7 |
| 7 |
| 10 |
| 10 |
| 7 |
x=
| 150 |
| 7 |
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