Question

22222222（八个二）×22222222（八个二）“怎么简便计算啊?

Answer 1

22222222*22222222=4*11111111*11111111=4*123456787654321=493827150617284

11*11=121.111*111=12321.1111*1111=1234321.11111*11111=123454321______________