甲:乙:(1)把甲看作单位“1”,则乙是甲的 .(2)把乙看作单位“1”,则甲是乙的 .
= ÷ = (最后结果填小数).
4﹕ ﹦﹦﹦20÷ ﹦ %
÷ ===0.75.
= :24= %= (填小数)
=2÷5= :15= %.