1) $$13-6+8 = 7+8 = 15$$
2) $$14-9+6 = 5+6 = 11$$
3) $$80 - (12 - 7) = 80 - 5 = 75$$
4) $$90 - (14 - 8) = 90 - 6 = 84$$
5) $$32 - 7 = 25$$
6) $$45 - 9 = 36$$
Ответ: 15, 11, 75, 84, 25, 36