б)2целых3/4:(-2/5 + 1целых1/2)-(-3/4-5/6):3целых1/6 в)(-2/15-1цел7/12)*30/103 +2 : 2цел1/4 * 9/32 г)(-3цел1/2 :

б) 2 3/4 : (-2/5 + 1 1/2) - (-3/4 - 5/6) : 3 1/6 = (2 * 4 + 3)/4 : (-2 * 2/10 + 5 * 3/10) - (-3 * 3/12 - 2 * 5/12) : (3 * 6 + 1)/6 = 11/4 : (-4/10 + 15/10) - (-9/12 - 10/12) : 19/6 = 11/4 : 11/10 - 1/12 : 19/6 = 11/4 * 10/11 - 1/12 * 6/19 = 10/4 - 1/38 = 190/76 - 2/76 = 188/76 = 47/19;

в) (-2/15 - 1 7/12) * 30/103 + 2 : 2 1/4 * 9/32 = (-2/15 - 19/12) * 30/103 + 2 : 9/4 * 9/32 = (-8/60 - 95/60) * 30/103 + 1/4 = -103/60 * 30/103 + 1/4 = -2/4 + 1/4 = -1/4;

г) (-7/2 : 14/3 - 14/3 : 7/2) * (-24/5) = (7/2 * 3/14 + 14/3 * 2/7) * 24/5 = (3/4 + 4/3) * 24/5 = (9/12 + 16/12) * 24/5 = 25/12 * 24/5 = 10.