题目内容
解比例.
(1)20:x=
|
(2)x:0.4=0.6:0.3 | (3)
|
(1)20:x=
:
x=20×
,
x÷
=16÷
,
x=56;
(2)x:0.4=0.6:0.3,
0.3x=0.4×0.6,
0.3x÷0.3=0.24÷0.3,
x=0.8;
(3)
=
,
18x=25×3.6,
18x÷18=90÷18,
x=5.
| 2 |
| 7 |
| 4 |
| 5 |
| 2 |
| 7 |
| 4 |
| 5 |
| 2 |
| 7 |
| 2 |
| 7 |
| 2 |
| 7 |
x=56;
(2)x:0.4=0.6:0.3,
0.3x=0.4×0.6,
0.3x÷0.3=0.24÷0.3,
x=0.8;
(3)
| 25 |
| x |
| 18 |
| 3.6 |
18x=25×3.6,
18x÷18=90÷18,
x=5.
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