(12целых5\22+7целых17\22)-(13целых7\23-9целых15\23

((12 + 5/22) + (7 + 17/22)) - ( (13 + 7/23 )- (9 + 15/23)) =(19 + 5/22+17/22) - ( 13 +7/23 - 9 - 15/23) =(19 + 22/22) - ( 4 + 7/23 - 15/23) =20 - ( 3 + 23/23 + 7/23 - 15/23) =20 - (3 + (23+7-15) /23) =20 - 3 - 15/23 = 16 +23/23 - 15/23 = 16 + 8/23 = 16 целых 8/23