Tolong Iyha... Kecuali Nomor 2,3,9,16dan9...

Jawaban :
25.
(a²b)³ . (a²b⁴)^-1
= a^6 b³ a^-2 b^-4
= a^6.a^-2 b³.b^-4
= a^6+(-2) b^3+(-4)
= a⁴b^-1

28.
(kurang tau)

18.
(3.3-1)^2/3
= (9-1)^2/3
= (8)^2/3
= (2³)^2/3
= 2^6/3
= 2²
= 4

21.
(2x² - 4 + 3x²)/2x²
= 2x² + 3x² - 4/2x²
= 3x² - 4

30.
8/2-√3 = 8/2-√3 . 2+√3/2+√3
= 8(2 + √3)/(2-√3)(2+√3)
= 16+8√3/4-3
= 16+8√3/1
= 16+8√3