a) y² + 3y = y(y + 3)
б) 4a³ - 12a = 4a(a² - 3)
в) ay - 5a - 5x + xy = (ay + xy) - (5a + 5x) = y(a + x) - 5(a + x) = (a + x)(y - 5)
г) y² - my - ny + mn = (y² - ny) - (my - mn) = y(y - n) - m(y - n) = (y - n)(y - m)
a) y² + 3y = y(y + 3)
б) 4a³ - 12a = 4a(a² - 3)
в) ay - 5a - 5x + xy = (ay + xy) - (5a + 5x) = y(a + x) - 5(a + x) = (a + x)(y - 5)
г) y² - my - ny + mn = (y² - ny) - (my - mn) = y(y - n) - m(y - n) = (y - n)(y - m)