a) (15x - 10xy) / 5xy = (5x(3 - 2y)) / (5xy) = (3 - 2y) / y
б) (m² - 4) / (2m - 4) = ((m + 2)(m - 2)) / 2(m - 2) = (m + 2) / 2
в) (25 - a²) / (a² - 10a + 25) = (5 - a)(5 + a) / ((a - 5)²) = -(a - 5) / (a - 5) = -1
a) (15x - 10xy) / 5xy = (5x(3 - 2y)) / (5xy) = (3 - 2y) / y
б) (m² - 4) / (2m - 4) = ((m + 2)(m - 2)) / 2(m - 2) = (m + 2) / 2
в) (25 - a²) / (a² - 10a + 25) = (5 - a)(5 + a) / ((a - 5)²) = -(a - 5) / (a - 5) = -1