看你是MM的份上,帮你解开吧(-4又1/4)-(+5又1/3)-(-4又1/4)=?=(-4又1/4)+(4又1/4)-(+5又1/3)=(-5又1/3) (-4又7/9)-(-3又1/6)-(+2又2/9)+(-6又1/6)=?=(-4又7/9)-(+2又2/9)-(-3又1/6)-(+6又1/6)=-2又5/9-6又1/6