F(X)在X点处二阶可导,求LIM[F(X+H)-2F(X)+F(X-H)]/H^2H趋于0标答是F#39;#39;(X)
<p>问题：F(X)在X点处二阶可导,求LIM/H^2H趋于0标答是F#39;#39;(X)<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">江保根的回答：<div class="content-b">网友采纳 以下极限都是h趋于0 lim/h^2 (用洛必塔法则) =lim/2h =lim(1/2){/h-/(-h)} =(1/2) =0 注意： lim/h=lim/(-h)=f'(x)
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