5.4x19.9+0.54怎样用简便计算?
问题描述:
5.4x19.9+0.54怎样用简便计算?
答
5.4x19.9+0.54
=5.4x19.9+5.4x0.1
=5.4x(19.9+0.1)
=5.4X20
=108