tolong yaaa nomer 4,5,6! pake cara! yg jelas! besok dikumpulin

jawab

4)

[ y⁻¹ + xy⁻² ] / [ 1 - x² y⁻²] = ...kalikan y²/y²

= y² [ y⁻¹ + x y⁻²] /  y² [1 - x² y⁻²] 

= [ y + x ] /[ y²  - x²]

= [ y + x ] / [y + x][y - x]
= 1/ [ y - x]
jawab A

5)  y = xˣ

6) 
f(x) = 75. 5ˣ⁻⁵

f(3 )= 75. 5³⁻⁵
f(3) = 75. 5⁻²
f(3) = 75 (1/25)
f(3) = 3