51又2/3÷5/3+71又3/4÷7/4+91又4/5÷9/5用简便方法计算

问题描述:

51又2/3÷5/3+71又3/4÷7/4+91又4/5÷9/5用简便方法计算

51又2/3÷5/3+71又3/4÷7/4+91又4/5÷9/5
=(50+5/3)×3/5+(70+7/4)×4/7+(90+9/5)×5/9
=30+1+40+1+50+1
=123