考點(diǎn):百分?jǐn)?shù)的加減乘除運(yùn)算
專題:文字?jǐn)⑹鲱}
分析:①根據(jù)“甲數(shù)是乙數(shù)的
”把甲數(shù)看作5份,乙數(shù)是8份,用乙數(shù)的份數(shù)除以甲數(shù)的份數(shù),就是乙數(shù)是甲數(shù)的百分之幾;
②根據(jù)“甲數(shù)比乙數(shù)少
”把甲數(shù)看作4份,乙數(shù)5份,用乙數(shù)比甲數(shù)多的1份除以甲數(shù)的份數(shù),就是乙數(shù)就比甲數(shù)多百分之幾;
③根據(jù)“甲數(shù)比乙數(shù)多
”把甲數(shù)看作5份,乙數(shù)4份,用乙數(shù)比甲數(shù)少的1份除以甲數(shù)的份數(shù),就是乙數(shù)就比甲數(shù)少百分之幾;據(jù)此得解.
解答:
解:①8÷5=160%
答:乙數(shù)就是甲數(shù)的 160%.
②1÷4=25%
答:乙數(shù)就比甲數(shù)多25%.
③1÷5=20%
答:乙數(shù)就比甲數(shù)少 20%.
故答案為:160,25,20.
點(diǎn)評:本題是求一個(gè)數(shù)是另一個(gè)數(shù)的百分之幾,關(guān)鍵是看把誰當(dāng)成了單位“1”,單位“1”的量為除數(shù).