9999×8889+3333×3333+9 (简算

2024-12-30 12:53:34
推荐回答(1个)
回答1:

9999x8889+3333x3333+9
=9999x8889+3333x3x1111+9
=9999x(8889+1111)+9
=9999x10000+9
=99990000+9
=9999009