考點(diǎn):百分?jǐn)?shù)的實(shí)際應(yīng)用
專題:分?jǐn)?shù)百分?jǐn)?shù)應(yīng)用題
分析:根據(jù)題干中的算式可得分析如下:
(1)把去年植樹(shù)的棵數(shù)看作單位“1”,則今年植樹(shù)的棵數(shù)是去年的85%;
(2)把去年植樹(shù)的棵數(shù)看作單位“1”,則今年植樹(shù)的棵數(shù)是去年的(1+15%);
(3)把去年植樹(shù)的棵數(shù)看作單位“1”,則今年植樹(shù)的棵數(shù)是去年棵數(shù)的(1-5%),據(jù)此解答.
解答:
解:(1)260×85%條件:今年植樹(shù)的棵數(shù)是去年的85%;
(2)260×(1+15%)條件:今年植樹(shù)的棵數(shù)比去年多15%;
(3)260×(1-5%)條件:今年植樹(shù)的棵數(shù)比去年少5%.
故答案為:今年植樹(shù)的棵數(shù)是去年的85%;今年植樹(shù)的棵數(shù)比去年多15%;今年植樹(shù)的棵數(shù)比去年少5%.
點(diǎn)評(píng):本題要運(yùn)用解決“比多比少問(wèn)題”的解決方法進(jìn)行解答,單位“1”知道用乘法計(jì)算.