数学题:四一班买了30只红气球和黄气球装点教室

  • 时间:2020-06-07 17:40:52
  • 分类:数学世界
  • 阅读:153 次

数学题:庆六一,四一班买了30只红气球和黄气球装点教室。红气球吹爆了两只,还比黄气球的两倍多四只。四一班原来红气球、黄气球各买了多少只?(求解题思路和算式)

数学题解答

30-2-4=24(只)…………从总数中去掉吹爆的和多的4只

把黄气球个数看成1份,则去掉吹爆的和多的之后的红气球是2份,两种颜色一共是3份。

24÷(1+2)=8(只)………………这是黄气球

30-8=22(只)…………这是原来的红气球

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