(-4又7/9)-(-3又1/6)-(+2又2/9)+(-6又1/6)-|1/3-1/2|
=-(4又7/9+2又2/9)+(3又1/6-6又1/6)-(1/2-1/3)
=-7+(-3)-1/6
=-10-1/6
=-10又1/6