3.6+9.9*99+6.3怎样巧算
问题描述:
3.6+9.9*99+6.3怎样巧算
答
原式=9.9×99+9.9
=9.9×(99+1)
=990
答
3.6+9.9*99+6.3
=9.9+9.9*99
=9.9*(1+99)
=9.9*100
=990