一个分数约分之后是,原分数的分子与分母的和是72,则原分数是 .
26: 69 = ÷2= (填小数)= %=.
==5÷ = (填小数)
= ÷ == (填小数)
12:18==6÷ =16: .
÷15=0.6= 折.