49.2-0.5*0.5-8.75怎么用简便方法计算?
问题描述:
49.2-0.5*0.5-8.75怎么用简便方法计算?
答
49.2-0.5*0.5-8.75
=49.2-0.25-8.75
=49.2-(0.25+8.75)
=49.2-9
=40.2