5/9×86又7/11+5/11×9/1+4×5/11简算解,得：(5/9)*(86又7/11)+(5/11)*9+4*(5/11)==(5/9)[86+(7/11)]+9*(5/11)+4*(5/11)==(5/9)*86+(5/9)*(7/11)+9*(5/11)+4*(5/11)==(5/9)*86+(5/9)*[(2/11)+(5/11)]+9*(5/11)+4*(5/...