从80里减去25个2,所得的差再除以10,求商是多少的算式是 .
3: ==24÷ = %=五折=.
3÷4== ÷24== 小数.
= ÷ = (填小数)==.
= : =15÷ = %
= :20=4.5÷ = %=0.5 .