νεκκοιανδ

摘要： 1 设切于 \((x_0,\ln x_0)\)，则 \(l:y=\frac{1}{x_0}(x-x_0)+\ln x_0(2 \le x_0 \le 6)\) \[ \begin{aligned} S=S(x_0)=&\int_2^6 \left(\frac{x-x_0}{x_0}+\ln x_0- 阅读全文