奇特的算法

  • 时间:2020-04-12 12:50:14
  • 分类:数学世界
  • 阅读:147 次

奇特的算法:我们常常会遇到被减数与减数的个位、十位上的数字正好互换的题目,如:91-19,82-18,73-37等。

计算这一类题目有一种特殊的简便方法,只要用被减数十位上的数字与个位上数字的差乘9,就可以得到结果。

比如:73-37,可以这样算:7-3=4 → 4×9=36 → 73-37=36。神奇吧!你也来试试吧!

找几道这样的题目,用上面的方法算一算,看看是否真的与正确的得数相同。

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