Разложите на множители: 1)x(y+5)+5+y 2)b-c-a(c-b) 3)ab-ac+4c-4b

1) x(y + 5) + 5 + y = x(y + 5) + (y + 5) = (y + 5)(x + 1)

2)  b - c - a(c - b) = b - c + a(b - c) = (b - c)(1 + a)

3)  ab - ac + 4c - 4b = a(b - c) + 4(c - b) = a(b - c) - 4(b - c) = (b - c)(a - 4)