题目内容
求比值.
(1)
|
(2)0.3:0.09 | (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)
:3,
=
÷3,
=
×
,
=
;
(2)0.3:0.09,
=
:
,
=
÷
,
=
×
,
=
;
(3)
:
,
=
÷
,
=
×10,
=8.
| 3 |
| 5 |
=
| 3 |
| 5 |
=
| 3 |
| 5 |
| 1 |
| 3 |
=
| 1 |
| 5 |
(2)0.3:0.09,
=
| 3 |
| 10 |
| 9 |
| 100 |
=
| 3 |
| 10 |
| 9 |
| 100 |
=
| 3 |
| 10 |
| 100 |
| 9 |
=
| 10 |
| 3 |
(3)
| 4 |
| 5 |
| 1 |
| 10 |
=
| 4 |
| 5 |
| 1 |
| 10 |
=
| 4 |
| 5 |
=8.
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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