3/40:7/20=3/40 ×20/7=3/14
1.8:5/6 =9/5×6/5=54/25
3/2:0.3 =3/2 ×10/3=5
化简比:270:15/2=270×2/15=36:1
4.9:350=49:3500=7:500
0.75:8/3 =3/4:8/3=9:32
13/2:26/3=13/2×3/26=3:4
3/40:7/20=3/40 ×20/7=3/14
1.8:5/6 =9/5×6/5=54/25
3/2:0.3 =3/2 ×10/3=5
化简比:270:15/2=270×2/15=36:1
4.9:350=49:3500=7:500
0.75:8/3 =3/4:8/3=9:32
13/2:26/3=13/2×3/26=3:4