16. B. 1 dan 3
(1) ³log 2 + ³log 4 = ³log 4×2 = ³log 8 (Bener)
(2) ³log 30 - ³log 3 = ³log 30/3 = ³log 10 (Salah)
(3) ³log 5 + ³log 1/25 = ³log 5 + ³log 5^-2 = ³log 5.5^-2
= ³log 5^-1 = ³log 1/5 (Bener)
(4) udh pasti salah
17. B. 4
= ³log5. 5 log 81
= ³log5. 5 log 3⁴
= ³log5 . 4. 5log 3
= 4
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16. B. 1 dan 3
(1) ³log 2 + ³log 4 = ³log 4×2 = ³log 8 (Bener)
(2) ³log 30 - ³log 3 = ³log 30/3 = ³log 10 (Salah)
(3) ³log 5 + ³log 1/25 = ³log 5 + ³log 5^-2 = ³log 5.5^-2
= ³log 5^-1 = ³log 1/5 (Bener)
(4) udh pasti salah
17. B. 4
= ³log5. 5 log 81
= ³log5. 5 log 3⁴
= ³log5 . 4. 5log 3
= 4