1连一连答案
4 : 5 = 12 : 15
0.6 : 0.8 =3/5:4/5
3 : 1.2 = 0.5 :0.2
2/3:1/5=1/3:1/10
2做一做答案
(1)8 :10 = 12 :15
(2)不能组成比例
(3)1/6:1/9= 18 :12
(4)0.8 :0.4 = 2/5:1/5