а) ab + 3b - 5b - 15 = b(a + 3 - 5) - 15 = b(a - 2) - 15
б) 2xy - y + 8x - 4 = y(2x - 1) + 4(2x - 1) = (2x - 1)(y + 4)
а) ab + 3b - 5b - 15 = b(a + 3 - 5) - 15 = b(a - 2) - 15
б) 2xy - y + 8x - 4 = y(2x - 1) + 4(2x - 1) = (2x - 1)(y + 4)