9.9*99+9.9简便算法怎算?
问题描述:
9.9*99+9.9简便算法怎算?
答
9.9*99+9.9
=9.9*(99+1)
=9.9*100
=990
9.9*99+9.9简便算法怎算?
9.9*99+9.9
=9.9*(99+1)
=9.9*100
=990