某超市一月份的营业额为36万元,三月份的营业额为48万元,设每月

某超市一月份的营业额为36万元,三月份的营业额为48万元,设每月的平均增长率为x,则可列方程为(    

A481x2=36    B481+x2=36      C361x2=48     D361+x2=48

答案

D

【分析】

主要考查增长率问题,一般用增长后的量=增长前的量×1+增长率),如果设教育经费的年平均增长率为x,然后根据已知条件可得出方程.

【详解】

某超市一月份的营业额为36万元,每月的平均增长率为x

二月份的营业额为361+x),三月份的营业额为361+x×1+x=361+x2.

根据三月份的营业额为48万元,可列方程为361+x2=48.

故选D.

【点睛】

本题考查了一元二次方程的应用,找到关键描述语,就能找到等量关系,是解决问题的关键.同时要注意增长率问题的一般规律.

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