Question

16．校園里有楊樹(shù)20棵，柳樹(shù)是楊樹(shù)的$\frac{3}{4}$，槐樹(shù)是柳樹(shù)的$\frac{3}{5}$．槐樹(shù)有多少棵？

Answer 1

分析 首先把楊樹(shù)的棵數(shù)看作單位“1”，柳樹(shù)是楊樹(shù)的$\frac{3}{4}$，根據(jù)一個(gè)數(shù)乘分?jǐn)?shù)的意義，用乘法求出柳樹(shù)的棵數(shù)，再把柳樹(shù)的棵數(shù)看作單位，槐樹(shù)是柳樹(shù)的$\frac{3}{5}$．再根據(jù)一個(gè)數(shù)乘分?jǐn)?shù)的意義，用乘法即可求出槐樹(shù)的棵數(shù)．

解答 解：20×$\frac{3}{4}$×$\frac{3}{5}$
=15×$\frac{3}{5}$
=9（棵），
答：槐樹(shù)有9棵．

點(diǎn)評(píng) 此題屬于簡(jiǎn)單的分?jǐn)?shù)乘法應(yīng)用題，關(guān)鍵是確定單位“1”，根據(jù)一個(gè)數(shù)乘分?jǐn)?shù)的意義解答．