Ответ:13 − 7 = 6; 6 + 6 = 12; 12 − 8 = 4.5 + 8 = 13; 13 − 4 = 9; 9 + 3 = 12.16 − 8 = 8; 8 + 4 = 12; 12 − 9 = 3.9 + 6 = 15; 15 − 8 = 7; 7 + 7 = 14.Ответ: 6, 12, 4; 13, 9, 12; 8, 12, 3; 15, 7, 14.