Вычислите: а) 11 целых 1/3*3 б) - 3 целых 3/4*1/5 в) - 6 целых 2/5 * (-7 целых 1/2) г) 13/50: (-13/25)

а) 11 1/3 * 3 = (11 * 3 + 1) / 3 * 3 = 33 + 1 = 34;

б) - 3 3/4 * 1/5 = - (3 * 4 + 3) / 4 * 1/5 = - (12 + 3) / (4 * 5) = - 15/20 = - 3/4;

в) - 6 2/5 * (-7 1/2) = (6 * 5 + 2) / 5 * (7 * 2 + 1) / 2 = (30 + 2) / 5 * (14 + 1) / 2 = 32/5 * 15/2 = (32 * 15) / (5 * 2) = 16 * 3 = 48;

г) 13/50 : (-13/25) = - 13/50 * 25/13 = - (13 * 25) / (50 * 13) = - 1/2.