题目内容
解方程.
12.48:x=
| x-20%x=
|
|
(1)12.48:x=
:
,
x=12.48×
,
x×3=3.12×3,
x=9.36,
(2)x-20%x=
,
80%x=
,
80%x÷80%=
÷80%,
x=
,
(3)
x-
x=1.
x=1,
x×
=1×
,
x=
.
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 3 |
x=9.36,
(2)x-20%x=
| 2 |
| 9 |
80%x=
| 2 |
| 9 |
80%x÷80%=
| 2 |
| 9 |
x=
| 5 |
| 18 |
(3)
| 2 |
| 3 |
| 1 |
| 5 |
| 7 |
| 15 |
| 7 |
| 15 |
| 15 |
| 7 |
| 15 |
| 7 |
x=
| 15 |
| 7 |
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