题目内容

(1)求比值
60:42 4.8:7.5
3
8
9
20
3.5:8
2
5
(2)化简比
51:68
72
16
0.75:3.75 0.25:
1
4
60:42=60÷42=
10
7


4.8:7.5=(4.8×10)÷(7.5×10)=48÷75═
48
75
=
16
25


3
8
9
20
=
3
8
÷
9
20
=
5
6


3.5:8
2
5
=
35
10
42
5
=
35
10
÷
42
5
=
35
10
×
5
42
=
5
12



(2)51:68=(51÷17):(68÷17)=3:4;

72
16
=(72÷8):(16÷8)=9:2;

0.75:3.75=(0.75×100):(3.75×100)=75:375=1:5;

0.25:
1
4
=0.25:0.25=(0.25×100):(0.25×100)=1:1.
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