1)1/2-(+4)=1/2-8/2= -7/2 или -3 1/2
2)-5/11-(-5/11)= -5/11+5/11=0
3)-5-(-2 1/3)= -5+2 1/3= -(5-2 1/3)= -2 2/3 или -8/3
4)-8-(-1/7)=-8+1/7= -(8-1/7)= -7 6/7 или -55/7
5)1/6-(+3)=1/6-3= -(3-1/6)= -2 5/6 или -17/6
6)-5/12-(-4)= -5/12+4=4-5/12=3 7/12 или 43/12