A)15 7/24:3 7/20= б)(-20 1/4)•20 5/9= в)2 3/5:1 11/15= г)3 1/5:(-9 3/5)= д)11 7/13•1 23/55= е)4 22/55•(-3 17/27)=

A) 15 7/24 : 3 7/20 = (15 * 24 + 7)/24 : (3 * 20 + 7)/20 = 367/24 : 67/20 = 367/24 * 20/67 = (367 * 20)/(24 * 67) = 1835/402;

б) (-20 1/4) * 20 5/9 = -(20 * 4 + 1)/4 * (20 * 9 + 5)/9 = -81/4 * 185/9 = -(81 * 185)/(4 * 9) = -1665/4;

в) 2 3/5 : 1 11/15 = (2 * 5 + 3)/5 : (1 * 15 + 11)/15 = 13/5 : 26/15 = 13/5 * 15/26 = 3/2;

г) 3 1/5 : (-9 3/5) = -(3 * 5 + 1)/5 : (9 * 5 + 3)/5 = -16/5 : 48/5 = -16/5 * 5/48 = -1/3;

д) 11 7/13 * 1 23/55 = 150/13 * 78/55 = 180/11;

е) 4 22/55 * (-3 17/27) = 242/55 * (-98/27) = -2156/135.