tolong dibantu. yang di lingkari ☺

nomor 4
(16 x^5 y^3) . (1/2^3 x^-3 y^-2)
= (2^4 x^5 y^3) (2^-3 x^-3 y^-2)
= 2^4+(-3) x^5+(-3) y^3+(-2)
=2 x^2 y

nomor 5
(2 - 1/2 - 1/2^2)^-2
= (2 - 1/2 - 1/4)^-2
= (8/4 - 2/4 - 1/2)^-2
= (5/4)^-2
= 1/(5/4)^2
= 1/(25/16)
= 16/25

gitu bukan ya maaf kalo salah TT