Question

18．果園里梨樹(shù)的棵數(shù)比桃樹(shù)多25%，下面說(shuō)法不正確的是（　�。�

• A． 桃樹(shù)的棵數(shù)比梨樹(shù)少25%
• B． 桃樹(shù)的棵數(shù)比梨樹(shù)少20%
• C． 梨樹(shù)的棵數(shù)是桃樹(shù)的125%
• D． 桃樹(shù)的棵數(shù)是梨樹(shù)的80%

Answer 1

分析 果園里梨樹(shù)的棵數(shù)比桃樹(shù)多25%，把桃樹(shù)的棵數(shù)看作單位“1”，則梨樹(shù)的棵數(shù)是桃樹(shù)的（1+25%）=125%，
則桃樹(shù)的棵數(shù)比梨樹(shù)少：25%÷125%=20%，桃樹(shù)的棵數(shù)是梨樹(shù)的：1÷125%=80%；由此結(jié)合選項(xiàng)分析、解答即可．

解答 解：果園里梨樹(shù)的棵數(shù)比桃樹(shù)多25%，把桃樹(shù)的棵數(shù)看作單位“1”，則梨樹(shù)的棵數(shù)是桃樹(shù)的（1+25%）=125%，則：
A、桃樹(shù)的棵數(shù)比梨樹(shù)少25%，說(shuō)法錯(cuò)誤，因?yàn)閱挝弧?”不同；
B、桃樹(shù)的棵數(shù)比梨樹(shù)少：25%÷125%=20%，說(shuō)法正確；
C、梨樹(shù)的棵數(shù)是桃樹(shù)的125%，說(shuō)法正確；
D、桃樹(shù)的棵數(shù)是梨樹(shù)的：1÷125%=80%，說(shuō)法正確；
故選：A．

點(diǎn)評(píng) 此題考查了百分?jǐn)?shù)的意義、分類及應(yīng)用，解答此題的關(guān)鍵是找單位“1”，進(jìn)一步發(fā)現(xiàn)比單位“1”多或少百分之幾，由此解決問(wèn)題．