题目内容
求比值
36:81 | 0.25:0.125 |
|
1.8:
|
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)36:81
=36÷81
=
;
(2)0.25:0.125
=0.25÷0.125
=2;
(3)
:
=
÷
=
×
=
;
(4)1.8:
=1.8÷
=4.
=36÷81
=
4 |
9 |
(2)0.25:0.125
=0.25÷0.125
=2;
(3)
2 |
5 |
5 |
6 |
=
2 |
5 |
5 |
6 |
=
2 |
5 |
6 |
5 |
=
12 |
25 |
(4)1.8:
9 |
20 |
=1.8÷
9 |
20 |
=4.
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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