а) (3а*(4а²-5))-а*(4-11а²)
3а*(4а²-5)-а*(4-11а²)
а*(3(4а²-5)-(4-11а²))
а*(12а²-15-4+11а²)
а*(23а²-19)
б) 8b*3c-8b*b+8b*14
24bc-8b²+112b
Ответ: 8•3=24 ...................
1. 4а - аb^2 + b + b^3 = (4a - ab^2) + (b - b^3) = a (2^2 - b^2) + b(1^2 - b^2) =
= a (2 - b) * (2 + b) + b (1 - b) * (1 + b).
2. bc^2 - 2c^2 - b^3 + 2b^2 = (bc^2 - 2c^2) - (b^3 - 2b^2) = c^2 (b - 2) - b^2 *
* (b - 2)= (b - 2) * (c^2 - b^2) = (b - 2) * (c - b) * (c + b).