Question

9．甲數(shù)是乙數(shù)的$\frac{5}{6}$，丙數(shù)是甲數(shù)的$\frac{3}{4}$，如果設(shè)乙數(shù)為“1”，則甲數(shù)對(duì)應(yīng)的分率為$\frac{5}{6}$，丙數(shù)的對(duì)應(yīng)分率是$\frac{5}{6}$×$\frac{3}{4}$，所以丙數(shù)是乙數(shù)的$\frac{5}{8}$．

Answer 1

分析 根據(jù)甲數(shù)是乙數(shù)的$\frac{5}{6}$，丙數(shù)是甲數(shù)的$\frac{3}{4}$，可知丙數(shù)是乙數(shù)的$\frac{5}{6}$的$\frac{3}{4}$，用乘法可求出丙數(shù)是乙數(shù)的幾分之幾，據(jù)此解答．

解答 解：$\frac{5}{6}$×$\frac{3}{4}$=$\frac{5}{8}$
答：甲數(shù)是乙數(shù)的$\frac{5}{6}$，丙數(shù)是甲數(shù)的$\frac{3}{4}$，如果設(shè)乙數(shù)為“1”，則甲數(shù)對(duì)應(yīng)的分率為$\frac{5}{6}$，丙數(shù)的對(duì)應(yīng)分率是$\frac{5}{6}$×$\frac{3}{4}$，所以丙數(shù)是乙數(shù)的$\frac{5}{8}$．
故答案為：$\frac{5}{6}$，$\frac{5}{6}$×$\frac{3}{4}$，$\frac{5}{8}$．

點(diǎn)評(píng) 本題重點(diǎn)考查了學(xué)生對(duì)求一個(gè)數(shù)的幾分之幾是多少用乘法計(jì)算方法來(lái)列式解答問(wèn)題的能力．