每个乘法或除法等式可以变成4个比例式.6x1.6=3.2x3可变为 6:3.2=3:1.6 6:3=3.2:1.6 3.2:6=1.6:3 3:6=1.6:3.20.3x3分之10=2x0.5可变为 0.3:2= 0.5:10/3 0.3:0.5=2:10/3 2:0.3 = 10/3 :0.5 0.5:0.3 = 10/3 :2...