数学题:参加数学兴趣小组的同学中

  • 时间:2020-05-01 11:23:54
  • 分类:数学世界
  • 阅读:147 次

数学题:参加数学兴趣小组的同学中,五年级比四年级的3倍少35人,两个年级的人数差是41人,两个年级参加数学兴趣小组的各有多少人?

数学题解答:根据题意,不妨用假设法来做。

如果五年级再增加35人,那么五年级人数就是四年级的3倍,同时两个年级的人数差是35+41=76(人)

此时的人数之差,也就是四年级人数的2倍,所以四年级兴趣小组的人数是:

76÷2=38(人)

五年级兴趣小组的人数是:38×3-35=79(人)或:38+41=79(人)

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