nilai dari 3log1/81+7log 35 - 7log5 adalah

[tex] {}^{3} log \frac{1}{81} + {}^{7} log35 - {}^{7}log5 \\ = {}^{3} log {3}^{ - 4} + {}^{7} log7 \times 5 - {}^{7} log5 \\ = {}^{3} log {3}^{ - 4} + {}^{7} log7 + {}^{7}log5 - {}^{7} log5 \\ = - 4 + 1 + 0 \\ = - 3[/tex]