1/3+(-1/2)= 2целых5/12+(-17 целых3/8= -29+17целых1/8=
1/3+(-1/2)=1/3-1/2=2/6-3/6= - 1/6 2 5/12+( - 17 3/8)=2 10/24 - 17 9/24= - 14 23/24 - 29+17 1/8= - 11 7/8