36*(0.25+0.75-0.25+0.75) 用简便方法计算
问题描述:
36*(0.25+0.75-0.25+0.75) 用简便方法计算
答
36*(0.25+0.75-0.25+0.75)
=36*(0.25+0.75)+36*(-0.25+0.75)
=36*1+36*0.5
=36+18
=54