摘要: \[\begin{aligned} & [u(x)\cdot v(x)]'\\ = & \lim_{\Delta x \to 0} \frac {u(x+\Delta x)v(x+\Delta x) - u(x)v(x)} {\Delta x}\\ = & \lim_{\Delta x \to 0} 阅读全文
posted @ 2024-03-06 10:59 ricky_lin 阅读(13) 评论(0) 推荐(0) 编辑