1. ax-ay+bx-by 2. 4x+ac+cx+4a 3. ab+ac-2b-2c 4. 6a+6y+pa+py 5. 4x+4y+16+xy

Решите задачу:

$ax - ay + bx + by = a(x - y) + b(x - y) = \\ = (x - y)(a + b) \\ 4x + ac + cx + 4a = 4(x + a) + c(x + a) = \\ = (x + a)(4 + c) \\ ab + ac - 2b - 2c = a(b + c) - 2(b + c) = \\ = (b + c)(a - 2) \\ 6a + 6y + pa + py = 6(y + a) + p(y + a) = \\ = (a + y)(6 + p) \\ 4x + 4y + 16 + xy = x(4 + y) + 4(4 + y) = \\ = (4 + y)(4 + x)$