1) a^2 + ab - 5a - 5b = (a - 5)(a + b)Подставляем a=6, b=6: (6 - 5)(6 + 6) = 1*12 = 12
2) 13915 + 18139 + 15261 + 18261 = 2085 + 2502 + 3915 + 4698 = 13200
1) a^2 + ab - 5a - 5b = (a - 5)(a + b)
Подставляем a=6, b=6: (6 - 5)(6 + 6) = 1*12 = 12
2) 13915 + 18139 + 15261 + 18261 = 2085 + 2502 + 3915 + 4698 = 13200