(6 целых 1/5 - 4 целых 1/3) : (-1 целая 1/3 )

(6 1/5 - 4 1/3) : (- 1 1/3) = - 1 2/5

1) 6 1/5 - 4 1/3 = 6 3/15 - 4 5/15 = 5 18/15 - 4 5/15 = 1 13/15 
2) 1 13/15 : ( - 1 1/3) = 28/15 : (- 4/3) = 28/15 * (- 3/4) = - (7*1)/(5*1) = - 7/5 = - 1 2/5