0.3:2.1= 1/18:1/36= 1/4小时=
问题描述:
0.3:2.1= 1/18:1/36= 1/4小时=
答
1:7
2:1
3:1
0.3:2.1= 1/18:1/36= 1/4小时=
1:7
2:1
3:1