Tolong di jawab di kumpul besok terima kasih no 3 sampai 9

Menyederhanakan bentuk aljabar

No. 3
3/(x + 1) + 3/(x-1)
= (3(x-1) + 3(x+1)) / (x² - 1)
= (3x - 3 + 3x + 3) / (x² - 1)
= (6x) / (x² - 1)

No. 4
x/(x+y) + y/(x-y)
= (x(x-y) + y(x+y)) / (x² - y²)
= (x² - xy + y² + xy) / (x² - y²)
= (x² + y²) / (x² - y²)

No. 5
4a/3x - 4/2x
= 4a/3x - 1/x
= (4ax - 3x) / 3x²
= x(4a - 1) / 3x²
= (4a - 1) / 3x