甲数是乙数的,甲、乙两数之和与乙数的比是 .
= ÷0.8=0.875= :24.
÷16== : = (填小数)
3÷ =6÷8= ÷12=51÷ = 填小数.
÷8=21÷ == : = (小数).
÷ ==3: = :24= (填小数)