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= ⁴Log 125 x ⁵Log 81 x ⁹Log ⅛
= (2²)'log 5³ x ⁵Log 3⁴ x (3³)'log 3^(-1)
= 3/2 * 4 * (-1/3) ²Log 5 x ⁵Log 3 x ³Log 3
= (-2) 2/3
= -4/3