Tolong jawab pertanyaan nomor 4 dan 5 beserta caranya ya, terima kasih

kalo gk jelas tanya ya, itu corat coret :)))

4) [x^(2/3) y^(-4/3)] / [y^(2/3) x^2]
= x^(2/3 - 2) y^(-4/3 - 2/3)
= x^(-4/3) y^(-6/3)
= 1^(-4/3) . 4^(-2)
= 1 . 1/(4^2)
= 1/16

5) (a - b)^-3 ((a + b)/(a - b))^-2 . 1/(a + b)^-3
= (a - b)^-3 . (a + b)^-2 / (a - b)^-2 . 1/(a + b)^-3
= (a - b)^-3 . (a + b)^-2 . (a - b)^2 . (a + b)^3
= (a - b)^(-3 + 2) . (a + b)^(-2 + 3)
= (a - b)^-1 . (a + b)
= (a + b)/(a - b)