题目内容
| 解方程. X-15=160×50%; | (x+
| x+5%x=19.95 |
(1)x-15=160×50%
x-15=80
x-15+15=80+15
x=95;
(2)(x+
)×40%=8
(x+
)×40%÷40%=8÷40%
x+
=20
x+
-
=20-
x=
(3 )x+5%x=19.95
105%x=19.95
105%x÷105%=19.95÷105%
x=19.
x-15=80
x-15+15=80+15
x=95;
(2)(x+
| 2 |
| 7 |
(x+
| 2 |
| 7 |
x+
| 2 |
| 7 |
x+
| 2 |
| 7 |
| 2 |
| 7 |
| 2 |
| 7 |
x=
| 138 |
| 7 |
(3 )x+5%x=19.95
105%x=19.95
105%x÷105%=19.95÷105%
x=19.
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