4÷12 = 16/48 = 2/6 = 10÷30 = 0.3(3循环) = 1/3
a/12=16/b=2/c=10/d=1/3a=4,b=48 c=6 d=30
4÷12＝16/48＝2/6＝10÷30＝1/3
4 48 6 30
