设f(x)在[a,b]上二阶可导,且f(a)=af(b)=bfquot;(x)＜0证明在（a,b）内f(x)＞x
<p>问题：设f(x)在上二阶可导,且f(a)=af(b)=bfquot;(x)＜0证明在（a,b）内f(x)＞x<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">刘石的回答：<div class="content-b">网友采纳 设F(x)=f(x)-x,则F'(x)=f'(x)-1,F''(x)=f''(x)
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