25:10 =5:2 0.3:0.4=3:4 130:65 =2:1 四又三分之一:12 =13/3:12=13:36 74:28 =37:14 121:11 =11:11 5.4:0.27 =20:1 0.7:7/13=13:10 20:35=4:7 0.6:3 =1:5 3:0.6=5:1
