Ответ на вопрос
а) 12z² - 9kz + 4nz - 3kn = 3z(4z - 3k) + n(4z - 3k) = (3z + n)(4z - 3k)б) a² - ab - bc - c² = a² - (a + b)c - c² = (a - c)(a + c) - (a + c)(b + c) = (a - c)(a + c - b - c) = (a - c)(a - b)в) 3x - 2x² + 3y - 2xy = x(3 - 2x) + y(3 - 2x) = (x + y)(3 - 2x)г) 20z²k + 2z - 5k + 1 = 2z(10zk + 1) - 5(k - 1) = 2z(10zk + 1) - 5(k - 1)
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