18.5—0.5*0.5—2.75简便计算
问题描述:
18.5—0.5*0.5—2.75简便计算
答
18.5—0.5*0.5—2.75
=18.5-0.25-2.75
=18.5-(0.25+2.75)
=18.5-3
=15.5