小红看的故事书一共有多少页

  • 时间:2020-06-22 15:49:22
  • 分类:数学世界
  • 阅读:70 次

问题是:小红看的故事书一共有多少页?小红看一本书,第一天看了2/15,第二天比第一天多看6页,看的页数和没看的页数比是3 :7。这本书共有多少页?

解答如下:画出线段图,就能理解题意,看的页数和没看的页数比是3 :7,也就是把整本书平均分成3+7=10份,已读的页数占总页数得3/10,未读的页数占总页数的7/10,第一天看了2/15,第二天比第一天多看6页,也就是全书的2/15还要加上6页,因为把全书看作单位“1”,单位“1”未知,所以应用除法,用具体的数量除以对应的分率。题中的具体数量只有6页,因此要用3/10-2/15-2/15=1/30,求出6页的对应分率,再用6÷1/30=180页。

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