27.5-(4.35+7.25)怎么算用简便计算
问题描述:
27.5-(4.35+7.25)怎么算用简便计算
答
27.5-(4.35+7.25)=27.5-(4.6+7)
=27.5-7-4.6
=20.5-4.5-0.1
=16-0.1
=15.9