摘要: \[ \because f(x)=e^{g(x)}\\ \therefore ln(f(x))=g(x)\\ \therefore\frac{f'(x)}{f(x)}=g'(x)\\ \therefore xf'(x)=xf(x)g'(x)\\ \therefore nf_n=\sum\limits 阅读全文
posted @ 2020-10-24 16:01 Adscn 阅读(223) 评论(0) 推荐(1) 编辑