-1=ln(3x)

解答

- 1 = ln (3 x)

x = \frac{1}{3 e}

十进制

x = 0.12262 \dots

求解步骤

- 1 = ln (3 x)

使用对数运算法则

\frac{1}{e} = 3 x

解

\frac{1}{e} = 3 x : x = \frac{1}{3 e}

x = \frac{1}{3 e}

lo g_{2} (x + 1) + lo g_{2} (x - 5) = 4

so l v e f or x, ln (2 x) = 4

lo g_{3} (x) = lo g_{3} (12)

2 ln (3 x - 5) - 2 = 2

(lo g_{3} (x) - 2) lo g_{3} (x) = 0