\documentclass[14pt,notheorems,leqno,xcolor={rgb}]{beamer}\usepackage{ctex}\usepackage{amsmath}%\new...
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\frametitle{费马引理}
{费马引理}\quad
设$f(x)$在点$x_0$的某邻域$U(x_0)$内有定义,
且$\forall x\in U(x_0)$有$f(x)\le f(x_0)$(或$f(x)\ge f(x_0)$).
如果$f(x)$在$x_0$处可导.则有$f’(x_0)=0$.
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错误提示为:Font shape ‘OTl/cmss/m/it’ in sizeundefined
作者追问:2019-12-09 18:17
回答: 2019-12-09 18:17
回答: 2019-12-09 18:17
作者追问:2019-12-09 18:17
回答: 2019-12-09 18:17
作者追问:2019-12-09 18:17
回答: 2019-12-09 18:17
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