题目内容
求下面各比的比值:
0.4:2;
:
;
:
; 6.5:1.3.
0.4:2;
| 5 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 3 |
考点:求比值和化简比
专题:比和比例
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)0.4:2
=0.4÷2
=
(2)
:
=
÷
=
×
=
(3)
:
=
÷
=
×3
=
(4)6.5:1.3
=6.5÷1.3
=5
=0.4÷2
=
| 1 |
| 5 |
(2)
| 5 |
| 8 |
| 3 |
| 4 |
=
| 5 |
| 8 |
| 3 |
| 4 |
=
| 5 |
| 8 |
| 4 |
| 3 |
=
| 5 |
| 6 |
(3)
| 1 |
| 4 |
| 1 |
| 3 |
=
| 1 |
| 4 |
| 1 |
| 3 |
=
| 1 |
| 4 |
=
| 3 |
| 4 |
(4)6.5:1.3
=6.5÷1.3
=5
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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