9999+8888+7777+6666+5555=?简便方法

分类: 作业答案 • 2021-12-31 13:23:57

问题描述：

答

9999+8888+7777+6666+5555
=1111x9+1111x8+1111x7+1111x6+1111x5
=1111x(9+8+7+6+5)
=1111x35
=1111x(30+5)
=1111x30+1111x5
=33330+5555
=38885