题目内容
解比例
|
| ||||||||
| 8:13=20:X. |
(1)
=
,
75x=25×1.2,
75x÷75=30÷75,
x=0.4,
(2)
=
,
0.25x=1.25×1.6,
0.25÷0.25=2÷0.25,
x=8,
(3)
:
=x:15,
x=
×15,
x÷
=
÷
,
x=40,
(4)8:13=20:x.
8x=13×20,
8x÷8=260÷8,
x=32.5.
| x |
| 25 |
| 1.2 |
| 75 |
75x=25×1.2,
75x÷75=30÷75,
x=0.4,
(2)
| 1.25 |
| 0.25 |
| x |
| 1.6 |
0.25x=1.25×1.6,
0.25÷0.25=2÷0.25,
x=8,
(3)
| 4 |
| 9 |
| 1 |
| 6 |
| 1 |
| 6 |
| 4 |
| 9 |
| 1 |
| 6 |
| 1 |
| 6 |
| 20 |
| 3 |
| 1 |
| 6 |
x=40,
(4)8:13=20:x.
8x=13×20,
8x÷8=260÷8,
x=32.5.
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