29.5-[(0.9+1/4)*15]除以1又7/8

问题描述:

29.5-[(0.9+1/4)*15]除以1又7/8
如题

29.5-【(0.9+1/4)*15】/(15/8)
=29.5-【1.15*15】/(15/8)
=29.5-17.25/1.875
=29.5-9.2
=20.3