题目内容
解方程.
x+
x=30
x-
x=50
1+20%x=1.2.
x+
| 1 |
| 5 |
x-
| 2 |
| 7 |
1+20%x=1.2.
①x+
x=30
(1+
)x=30
x=30
x×
=30×
x=25;
②x-
x=50
(1-
)x=50
x=50
x×
=50×
x=70;
③1+20%x=1.2
1+20%x-1=1.2-1
20%x=0.2
x=1.
| 1 |
| 5 |
(1+
| 1 |
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 5 |
| 6 |
| 5 |
| 6 |
x=25;
②x-
| 2 |
| 7 |
(1-
| 2 |
| 7 |
| 5 |
| 7 |
| 5 |
| 7 |
| 7 |
| 5 |
| 7 |
| 5 |
x=70;
③1+20%x=1.2
1+20%x-1=1.2-1
20%x=0.2
x=1.
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