问题 解答题
先化简比再求比值:
(1)42:28=______=______
(2)0.5:0.15=______=______
(3)
7
8
5
6
=______=______.
答案

(1)42:28=(42÷14):(28÷14)=3:2,

比值是:42:28=42÷28=1.5;

(2)0.5:0.15=(0.5×100):(0.15×100)=50:15=(50÷5):(15÷5)=10:3,

比值是:0.5:0.15=

50
100
15
100
=
50
100
×
100
15
=
10
3

(3)

7
8
5
6
=(
7
8
×24
):(
5
6
×24
)=21:20,

比值是:

7
8
5
6
=
7
8
÷
5
6
=
7
8
×
6
5
=
21
20

故填:(1)3:2,1.5;

(2)10:3,

10
3

(3)21:20,

21
20

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