2¾+0.25+(-7½)+(-2¼)+1.5+(-2.75)简算
问题描述:
2¾+0.25+(-7½)+(-2¼)+1.5+(-2.75)简算
答
2又3/4+0.25+(-7又1/2)+(-2又1/4)+1.5+(-2.75)=2.75+0.25+(-7.5)+(-2.25)+1.5+(-2.75)=[2.75+(-2.75)]+(0.25+1.5)+[(-7.5)+(-2.25)]=0+1.75+(-9.75)=-(9.75-1.75)=-8