题目内容
求比值:
| 15:9 |
|
0.3:
|
|
分析:求比值是根据比的意义(两个数相除又叫两个数的比),用比的前项除以比的后项.
解答:解:(1)15:9
=15÷9
=
(2)
:
=
÷
=
(3)0.3:
=0.3÷
=0.6
(4)
:
=
÷
=
=15÷9
=
| 5 |
| 3 |
(2)
| 4 |
| 7 |
| 4 |
| 9 |
=
| 4 |
| 7 |
| 4 |
| 9 |
=
| 9 |
| 7 |
(3)0.3:
| 1 |
| 2 |
=0.3÷
| 1 |
| 2 |
=0.6
(4)
| 5 |
| 8 |
| 2 |
| 3 |
=
| 5 |
| 8 |
| 2 |
| 3 |
=
| 15 |
| 16 |
点评:求比值是用比的前项除以后项,小数化成分数进行计算,结果最好用分数表示.
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