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\( \ln ( x ) + \frac { 1 } { x } > 2 \)

Ask by Clark Hampton. in China
Mar 17,2025

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满足不等式 \( \ln(x) + \frac{1}{x} > 2 \) 的 \(x\) 的值域是 \(x > 0\)。

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The Deep Dive

To tackle the inequality \( \ln ( x ) + \frac { 1 } { x } > 2 \), we first analyze the expression. The natural logarithm function \( \ln(x) \) only exists for \( x > 0 \). By substituting values into the inequality, you can find where the left side exceeds 2. For instance, at \( x = 1 \), \( \ln(1) + \frac{1}{1} = 0 + 1 = 1 \) (not greater than 2). Testing around \( x = 2 \) gives \( \ln(2) + 0.5 \approx 0.69 + 0.5 = 1.19 \). Through graphical analysis or by numerical methods (like calculus or iteration), you'll discover that the critical points where the expression transitions can help locate solutions. A deeper dive into the derivative of the left-side function can uncover intervals of increase or decrease, revealing the values of \( x \) meeting the inequality.

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