12×﹙5/6-5/9×27用简便方法计算,12×﹙5/6-5/9﹚×27

问题描述:

12×﹙5/6-5/9×27用简便方法计算,
12×﹙5/6-5/9﹚×27

12×﹙5/6-5/9﹚×27
=12×5/6×27-12×5/9×27
=270-180
=90