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20. b
21. b
maaf gak pake cara , jawabannya ribet ...
= 3^(-4 - (-6)) . 2^(3 - 8) . 5^(- 2 - 6)
= 3^2 . 2^(-5) . 5^(-8)
Jawaban: B
21) masukan saja a = 4 dan b = 5
(4^5 . (4^-2 . 5))/(4 . 5)^2
= 4^(5 - 2 - 2) . 5^(1 - 2)
= 4 . 5^-1
= 4/5
Jawaban: B
^ = pangkat