Tolong bantu jawab yg nomor 6-9 makasih

6) x/(x + y) + y/(x - y)
= (x(x - y) + y(x + y))/(x² - y²)
= (x² - xy + xy + y²)/(x² - y²)
= (x² + y²)/(x² - y²)

8) (x² - 5x - 6)/(x + 1)
= (x + 1)(x - 6)/(x + 1)
= x - 6

9) (3x² - 27)/(x² + 2x - 3)
= 3(x + 3)(x - 3)/(x + 3)(x - 1)
= 3(x - 3)/(x - 1)
= (3x - 9)/(x - 1)