求比值60:42         4.8:7.5       38:9203.5:825.

问题描述:

求比值
60:42         
4.8:7.5       

3
8
9
20

3.5:8
2
5

(1)60:42,
=60÷42,
=

10
7

        
(2)4.8:7.5,
=4.8÷7.5,
=
16
25

     
(3)
3
8
9
20

=
3
8
÷
9
20

=
5
6

(4)3.5:8
2
5

=3.5÷8
2
5

=3.5÷
42
5

=
5
12

答案解析:用比的前项除以后项即可.
考试点:求比值和化简比.

知识点:注意求比值的结果是一个商,可以是整数、小数或分数.