题目内容
| 解方程或比例 0.7:x=48:9
|
|
|
(1)0.7:x=48:9
,
48x=
×
,
48x÷48=
×
÷48,
48x×
=
×
×
,
x=
;
(2)
X+
X=52,
X=52,
X÷
=52÷
,
x=80;
(3)
:x=25%:
,
25%x=
×
,
25%x÷25%=
÷25%,
25%x÷
=
÷
,
x=
.
| 3 |
| 5 |
48x=
| 48 |
| 5 |
| 7 |
| 10 |
48x÷48=
| 48 |
| 5 |
| 7 |
| 10 |
48x×
| 1 |
| 48 |
| 48 |
| 5 |
| 7 |
| 10 |
| 1 |
| 48 |
x=
| 7 |
| 50 |
(2)
| 2 |
| 5 |
| 1 |
| 4 |
| 13 |
| 20 |
| 13 |
| 20 |
| 13 |
| 20 |
| 13 |
| 20 |
x=80;
(3)
| 10 |
| 7 |
| 1 |
| 20 |
25%x=
| 10 |
| 7 |
| 1 |
| 20 |
25%x÷25%=
| 1 |
| 14 |
25%x÷
| 1 |
| 4 |
| 1 |
| 14 |
| 1 |
| 4 |
x=
| 2 |
| 7 |
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