小学教育网 发表于 2016-8-15 11:15:26

六年级奥数试题及答案:工程问题

  一件工作,如果单独做,甲按规定时间可提前2天完成,乙则要超过规定时间3天才完成.现在,甲乙二人合做2天后,剩下的继续由乙单独做,刚好在规定的日期内完成.若甲乙二人合做,完成这件工作需要()天.
       
       
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jzfour 发表于 2016-8-15 11:47:48


       
          考点:工程问题.
       
          分析:求的是原计划的工效,工作时间明显,一定是根据工作总量来列等量关系.把工作总量看做单位“1”,设规定日期为x天,等量关系为:甲2天的工作总量+乙做完规定日期的工作总量=1.
       
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