999999999×888888888 / 111111111

分类: 作业答案 • 2021-12-03 17:47:59

问题描述：

999999999×888888888 / 111111111
简便运算

答

999999999×888888888 / 111111111
= 999999999*(888888888 / 111111111)
=(1000000000-1)*8
=1000000000*8-8
=8000000000-8
=7999999992