Verified answer

а) (204 + 408) : 17 = 204 : 17 + 408 : 17 = 12 + 24 = 36

б) (516 + 2193) : 43 = 516 : 43 + 2193 : 43 = 12 + 51 = 63

в) 462/33 + 538/33 = (462+538)/33 = 1000/33 = 1000 : 33 = 30 (ост. 10) = 30 целых 10/33.