来自段学超的问题
请写出解题过程:999×998998999-998×999999998
请写出解题过程:
999×998998999-998×999999998
1回答
2020-03-22 17:05
请写出解题过程:999×998998999-998×999999998
请写出解题过程:
999×998998999-998×999999998
=999x(998998998+1)-998x(999999999-1)
=(999x998x1001001+999)-(998x999x1001001-998)
=998+999
=1997