今年2月用电多少千瓦时

  • 时间:2020-05-22 15:51:38
  • 分类:数学世界
  • 阅读:139 次

王玲家今年三月份用电124千瓦时,电费68.20元。照这样计算,今年二月用电多少千瓦时?

数学题解答:二月份用电多少千瓦时,与电费是多少钱没有关系,所以题中的68.20元电费是一个多余条件,是起干扰解题作用的。真正有用的条件隐含在题目中,比如三月份为31天,今年二月份应是28天(今年是2013年,是平年)。还是用比例知识解。

解:设今年二月用电x千瓦时。

124:31=x:28

31x=124×28

x=124×28÷31

x=112

答:今年二月用电112千瓦时。

推荐阅读:
7 Tools to Help You find Out How Fast Your Blog Loads  The Superheroes of Video Marketing Infographic  10 Reasons Why You’re Not Getting Social Shares On Your Blog  5 Companies That Are Winning with Social Data and Email Marketin  How to Assure Your Customers That It’s Safe to Shop With You  5 Corporate Blogs that Bloggers Can Learn From  5 Rules to Create Successful Crypto-Related Content  How to Professionally Assess the Current Quality of Your Brand’s  Three Ways a Blog can Help Boost Your Real Estate Business  Hiring CGI Influencers Now a Trend for Brands: What it Means for 
评论列表
添加评论