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\bigskip
\begin{ejemplo}
$$a=b$$
\end{ejemplo}
%-----------------------------------------------------------------------------------
\clearpage
\begin{lema}
$$a=b$$
\end{lema}
\bigskip
\begin{corolario}
$$a=b$$
\end{corolario}
\bigskip
\begin{caja}[Una caja de comentario]
$$a=b$$
\end{caja}
\subsection{Tablas}
% \usepackage{array,tabularx}
% \usepackage[table, x11names]{xcolor}
\newcolumntype{Y}{>{\raggedleft\arraybackslash}X} % Ver tabularx
%
\tcbset{enhanced,fonttitle=\bfseries\large,fontupper=\normalsize\sffamily,
colback=LightCyan1,colframe=DarkOrange4,colbacktitle=DarkOrange4,
coltitle=black,center title
}
%%-Tabla - Estilo beamer
\begin{tcolorbox}[tabularx={X||X||X},title= {\white Iteraci´on}, beamer]
& $x_i$
& $y_i=f(x_i)$ \\\hline\hline
A & $x_0=0$
& $0$
\\\hline
B & $x_1=0.75$
& $-0.0409838$ \\\hline
C & $x_2=1.5$
& $1.31799$
\end{tcolorbox}
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