Номер 1150

1) 9 + a – (–13) – a – 8 = 9 + 13 – 8 = 22 – 8 = 22 + (–8) = 14

2) –25 – b + 12 – (–6) + b + 9 = –25 + 12 + 6 + 9 = 27 – 25 = 2