А) 8х^4 - 16x^3y = 8x^3(x-2y)
б) 15xy^5 + 10y^2 = 5y^2(3xy^3 + 2)
в) 8a^2 - 50y^2 = 2(4a^2 - 25y^2) = 2(4a - 5y)(4a + 5y)
г) 18b^2 - 98a^2 = 2(9b^2 - 49a^2) = 2(3b - 7a)(3b+7a)
д) x^3 - 125 = (x-5)(x^2 + 5x +25)
е) y^3 + 8 = (y+2)(y^2 - 2y + 4)
ж) ab + 8a + 9b + 72 = (ab + 8a) + (9b + 72) = a(b+8) + 9(b+8) = (b+8)(a + 9)
з) 6m - 12 - 2n + mn = (6m - 12) - (2n - mn) = 6(m-2) - n(2 - m) = 6(m - 2) + n(m - 2) = (m - 2)(6+n)