A×3/4=B×2/5,A不等于0,A:B写成最简单的整数比是_比值是_.

问题描述:

3
4
=B×
2
5
,A不等于0,A:B写成最简单的整数比是______比值是______.

假设B是1,由等量关系A×

3
4
=B×
2
5

可得,A×
3
4
=1×
2
5

即:A=
8
15

A:B写成最简单的整数比是:
8
15
:1=(
8
15
×15):(1×15)=8:15,
比值是:A:B=
8
15
:1=
8
15
÷1
=
8
15

故填:8:15,
8
15