从前往后数小明排在第7位

  • 时间:2020-04-22 15:41:35
  • 分类:数学世界
  • 阅读:129 次

数学题:一些小朋友排成一队,从前往后数小明排在第7位,从后往前数小明排在第9位。这队一共有多少人?

7+9-1=15(人)

思考:为什么减1?

提高题:一些小朋友排成一队,从前往后数小明和小刚分别排在第7位和第8位,从后往前数他们分别排在第10位和第11位。这队一共有多少?

思考:条件变多了,变复杂了,怎么算?

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