7.5*83-2.5*9
=7.5*83-7.5*3
=7.5*(83-3)
=7.5*80
=600
简便运算7.每亮客汉集把决握达船沙5*83-2.5*9
jacky
2024-05-23 22:49
阅读 481
jacky
2024-05-23 22:49
阅读 481
