решите пожалуйста как можно быстрее! даю все!

1) ab - ac + yb - yc = a * (b-c) + y * (b-c) = (b-c) * (a+y)

2) 3x + 3y - bx - by = 3 (x+y) - b * (x+y) = (x+y) * (3-b)

3) 4n - nc - 4 + c = n * (4-c) - (4-c) = (4-c) * (n-1)

4) x + x - 4x - 4 = x * (x + 1) - 4 (x + 1) = (x + 1) * (x - 4)

5) 6mn - 3m + 2n - 1 = 3m * (2n-1) + 2n - 1 = (2n-1) * (3m+1)

6) 4a - 5ay - 8a + 10y = a * (4a-5y) -2 (4a-5y) = (4a-5y) * (a -2)

7) ab - a + ab - 1 = a * (ab - 1) + ab - 1 = (ab-1) * (a+1)

8) xa - xb - ya + zb - za + yb = a * (x-y-z) - b * (x-z-y) = (x-y-z) * (a-b)