题目内容
解比例.
| 7.5:x=2.5:12 |
|
|
(1)7.5:x=2.5:12,
2.5x=7.5×12,
x=90÷2.5,
x=36;
(2)
:
=x:15,
x=15×
,
x×6=
×6,
x=40;
(3)
=
,
2x=6.5×4,
x=26÷2,
x=13.
2.5x=7.5×12,
x=90÷2.5,
x=36;
(2)
| 4 |
| 9 |
| 1 |
| 6 |
| 1 |
| 6 |
| 4 |
| 9 |
| 1 |
| 6 |
| 20 |
| 3 |
x=40;
(3)
| Χ |
| 6.5 |
| 4 |
| 5.2 |
2x=6.5×4,
x=26÷2,
x=13.
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