(3/4 + 0.25 - 1 5/24) : (2 3/4 - 4 1/2 - 0.75) : (-4 7/12) = -2/25 (или -0,08),
1) 3/4 + 0.25 - 1 5/24 = 3/4 + 1/4 - 29/24= 1/24 + 6/24 - 29/24 = -22/24 = -11/12,
2) 2 3/4 - 4 1/2 - 0.75 = 11/4 - 9/2 - 3/4 = 11/4 - 18/4 - 3/4 = -10/4 = -2 1/2,
3) -11/12 : (-2 1/2) = 11/12 : 5/2 = 11/12 * 2/5 = 11/30,
4) 11/30 : (-4 7/12) = -11/30 : 55/12 = -11/30 * 12/55 = -2/25 (или -0,08)