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3. ³log x = ³log² x
misal ³log x = y dengan x > 0
3y = y²
y² - 3y = 0
y(y-3)=0
y = 0 atau y = 3
..
³log x = 0 atau ³log x = 3
x = 3° = 1 atau x=3³ = 27
HP x = (1, 27)