用简便方法计算12.5x4.5+4.5x12.5+12.5

问题描述:

用简便方法计算12.5x4.5+4.5x12.5+12.5

12.5x4.5+4.5x12.5+12.5
=12.5x(4.5+4.5+1)
=12.5x10
=125