(1,2-1 7/15)*(-5/8)-1 1/6: 2 1/3 осталсь 2 минуты

1) 1,2 - 1 7/15 = 1 2/10 - 1 7/15 = 1 1/5 - 1 7/15 = 1 3/15 - 1 7/15 = -4/15
2) -4/15 * (-5/8) = 1/6
3) 1 1/6 : 2 1/3 = 7/6 : 7/3 = 7/6 * 3/7 = 1/2
4) 1/6 - 1/2 = 1/6 - 3/6 = -2/6 = -1/3