3/4:0.35
=0.75:0.35
=75:35
=15:7
0.24:0.12
=24:12
=2:1
3/5:2
=0.6:2
=6:20
=3:10
7/8:1/3
=21/24:8/24
=21:8
5/12小时:15分
=25:15
=5:3
1吨:300千
=1000:300
=10:310m比( )m多1/5，（）m比10m少20%10m比(25/3 )m多1/5（8）m比10m少20%