Question

9．甲數(shù)與乙數(shù)的比為3：5，則甲數(shù)是乙數(shù)的$\frac{3}{5}$，乙數(shù)比甲數(shù)多$\frac{2}{3}$．

Answer 1

分析 分別把甲數(shù)和乙數(shù)看作3份的數(shù)和5份的數(shù)，用甲數(shù)除以乙數(shù)即可求出甲數(shù)是乙數(shù)的幾分之幾；用甲數(shù)和乙數(shù)的差除以甲數(shù)即可求出乙數(shù)比甲數(shù)多幾分之幾．

解答 解：3÷5=$\frac{3}{5}$
（5-3）÷3
=2÷3
=$\frac{2}{3}$
答：甲數(shù)是乙數(shù)的$\frac{3}{5}$，乙數(shù)比甲數(shù)多 $\frac{2}{3}$．
故答案為：$\frac{3}{5}$，$\frac{2}{3}$．

點(diǎn)評(píng) 求一個(gè)數(shù)是另一個(gè)數(shù)的幾分之幾，用除法計(jì)算．