1/2 -(+4)
-5/11-(-5/11)
-5-(2 цел 1/3)
-8-(-1/7)
1/6-(+3)
-5/12 -(-4)

1/2 -(+4) =1/2-4=-3 1/2

-5/11-(-5/11) =-5/11+5/11=0

-5-(2 цел 1/3) =-5-2 1/3=-7 1/3

-8-(-1/7) =-8+1/7=-7 6/7

1/6-(+3)  =1/6-3=-2 5/6

-5/12 -(-4)=-5/12+4=3 7/12