设y=f(1/x),其中f(u)为二阶可导函数,则d^2y/dx^2=?
<p>问题：设y=f(1/x),其中f(u)为二阶可导函数,则d^2y/dx^2=?<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">罗楠的回答：<div class="content-b">网友采纳 dy/dx=f'(1/x)*(-1/x^2) d^2y/dx^2=f''(1/x)*(-1/x^2)(-1/x^2)+f'(1/x)*(2/x^3) =f''(1/x)/x^4+2f'(1/x)/x^3
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