题目内容
| 解下面的比例. (l)x:12=0.5:
|
(2)
| ||||||
| (3)x:6=0.7:0.28 | (4)20:3=50:x. |
(l)x:12=0.5:
,
x=12×0.5,
x÷
=6÷
,
x=18;
(2)
=
,
3.5x=15×28,
3.5x÷3.5=420÷3.5,
x=120;
(3)x:6=0.7:0.28,
0.28x=6×0.7,
0.28x÷0.28=4.2÷0.28,
x=15;
(4)20:3=50:x,
20x=3×50,
20x÷20=150÷20,
x=7.5.
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
x=18;
(2)
| 15 |
| x |
| 3.5 |
| 28 |
3.5x=15×28,
3.5x÷3.5=420÷3.5,
x=120;
(3)x:6=0.7:0.28,
0.28x=6×0.7,
0.28x÷0.28=4.2÷0.28,
x=15;
(4)20:3=50:x,
20x=3×50,
20x÷20=150÷20,
x=7.5.
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