(-5/12 - 3/4):2цел1/3+5цел1/3*0,75= (-2,5 - 1цел5/6):1цел4/9 - 3цел5/9*(-2цел1/4)= (-3,8+2цел 1/3)*(-1цел7/8)+4цел1/6:(-1цел2/3)=

(-5/12 - 3/4) : 2 1/3 + 5 1/3 * 0,75 = (-5/12 - 3 * 3/12) : (2 * 3 + 1)/3 + (5 * 3 + 1)/3 * 75/100 = (-5/12 - 9/12) : 7/3 + 16/3 * 3/4 = -14/12 * 3/7 + 16/4 = -(14 * 3)/(12 * 7) + 4 = -1/2 + 4 = 3,5;

(-2,5 - 1 5/6) : 1 4/9 - 3 5/9 * (-2 1/4) = (-25/10 - 11/6) : 13/9 - 32/9 * (-9/4) = (-15/6 - 11/6) * 9/13 + 32/9 * 9/4 = (-15 - 11)/6 * 9/13 + 32/4 = -26/6 * 9/13 + 8 = -(26 * 9)/(6 * 13) + 8 = -3 + 8 = 5;

(-3,8 + 2 1/3) * (-1 7/8) + 4 1/6 : (-1 2/3) = (-38/10 + 7/3) * (-15/8) + 25/6 : (-5/3) = (-114/30 + 70/30) * (-15/8) - 25/6 * 3/5 = (-114 + 70)/30 * (-15/8) - (25 * 3)/(6 * 5) = -44/30 * (-15/8) - 5/2 = (44 * 15)/(30 * 8) - 5/2 = 11/4 - 10/4 = (11 - 10)/4 = 1/4.