Question

校園里楊樹(shù)和柳樹(shù)共有48棵，楊樹(shù)的棵數(shù)是柳樹(shù)的2倍．楊樹(shù)和柳樹(shù)各有多少棵？

Answer 1

分析：根據(jù)題意，把柳樹(shù)棵數(shù)看作單位“1”，楊樹(shù)的棵數(shù)是柳樹(shù)的2倍那么48可就相當(dāng)于柳樹(shù)棵數(shù)的3倍，進(jìn)而求出柳樹(shù)的棵數(shù)，再求楊樹(shù)的棵數(shù)，解決問(wèn)題．

解答：解：柳樹(shù)棵數(shù)：
48÷（2+1），
=48÷3，
=16（棵）；

楊樹(shù)棵數(shù)：
16×2=32（棵）．
答：楊樹(shù)32棵，柳樹(shù)16棵．

點(diǎn)評(píng)：此題屬于和倍問(wèn)題：已知兩個(gè)數(shù)的和及這兩個(gè)數(shù)的倍數(shù)關(guān)系，求這兩個(gè)數(shù)．
方法：和÷（倍數(shù)+1）=1倍數(shù)（較小數(shù)），1倍數(shù)（較小數(shù)）×倍數(shù)=幾倍數(shù)（較大數(shù)）；或：和-1倍數(shù)（較小數(shù)）=幾倍數(shù)（較大數(shù)）