1,2+(-4 1/3)+(-1 13/15)= 1,2 -(4+1) - (1/3 + 13/15)
= 1,2 - 5 - (5/15 + 13/15)
= 1,2 - 5 - 18/15
= 1,2 - 5 - 1(3/15)
= 1,2 - 5 - 3/5
= -3,8 - 3/5
= -4(15/5) - 3/5
= -19/5
= -3 целая 4/5