а) 5 * (7 + 1/5) = 5 * 7 + 5 * 1/5 = 35 + 5/5 = 35 + 1 = 36;
б) 12 * 3 5/12 = 12 * (3 + 5/12) = 12* 3 + 12 * 5/12 = 36 + (12*5) / 12 = 36 + 5 = 41
