Question

13．有甲、乙、丙三個(gè)小隊(duì)去旅游，甲隊(duì)有16人，乙隊(duì)有14人．丙隊(duì)有17人．甲隊(duì)人數(shù)是乙隊(duì)人數(shù)的幾分之幾？乙隊(duì)人數(shù)是丙隊(duì)人數(shù)的幾分之幾？丙隊(duì)人數(shù)是乙隊(duì)人數(shù)的幾分之幾？

Answer 1

分析 根據(jù)分?jǐn)?shù)的意義，用甲隊(duì)人數(shù)除以乙隊(duì)人數(shù)即是甲隊(duì)人數(shù)是乙隊(duì)人數(shù)的幾分之幾；
用乙隊(duì)人數(shù)除以丙隊(duì)人數(shù)，即是乙隊(duì)人數(shù)是丙隊(duì)人數(shù)的幾分之幾；
用丙隊(duì)人數(shù)除以乙隊(duì)人數(shù)即是丙隊(duì)人數(shù)是乙隊(duì)人數(shù)．

解答 解：16÷14=$\frac{8}{7}$
14÷17=$\frac{14}{17}$
17÷14=$\frac{17}{14}$
答：甲隊(duì)人數(shù)是乙隊(duì)人數(shù)的$\frac{8}{7}$，乙隊(duì)人數(shù)是丙隊(duì)人數(shù)的$\frac{14}{17}$，丙隊(duì)人數(shù)是乙隊(duì)人數(shù)的$\frac{17}{14}$．

點(diǎn)評(píng) 此題屬于分?jǐn)?shù)除法應(yīng)用題中的一個(gè)基本類型：已知兩個(gè)數(shù)，求一個(gè)數(shù)是另一個(gè)數(shù)的幾分之幾．