数学题:一个筐里有桃子若干个

  • 时间:2020-06-07 17:40:52
  • 分类:数学世界
  • 阅读:76 次

数学题:一个筐里有桃子若干个,先取出其中的一半又一个,再取出余下的一半又一个,最后取出第二次取后余下的一半又一个,还剩一个桃子。问筐里原有桃子多少个?(由“秦子航-资优网”提问,“灰色-资优网”解答)

数学题解答:这道关于桃子的问题也应该用倒推法假设法相结合来解决。

题中一共取了三次桃子,最后剩下一个。

第三次如果没有取,应该剩下:(1+1)×2=4(个)

第二次如果没有取,应该剩下:(4+1)×2=10(个)

第一次如果没有取,应该剩下:(10+1)×2=22(个)

答:筐里原有桃子22个。

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