log_{9}(15-4n)= 1/2

解答

lo g_{9} (15 - 4 n) = \frac{1}{2}

n = 3

求解步骤

lo g_{9} (15 - 4 n) = \frac{1}{2}

使用对数运算法则

15 - 4 n = 3

解

15 - 4 n = 3 : n = 3

n = 3

3 ln (2 x - 7) = 9

ln (x) + ln (2 x + 1) = 2

lo g_{6} (x^{2} - 5 x) = 2

- 7 + lo g_{3} (4 - x) = - 6

2 lo g_{10} (x) = lo g_{10} (2) + lo g_{10} (3 x - 4)