```tex \documentclass[UTF8]{ctexart} \usepackage{tikz} \usetikzlibrary{decorations.pathreplacing,calligraphy} \usepackage{mathdots} \usepackage[paperwidth=55mm,paperheight=36mm,text={52mm,30mm},left=1.5mm,top=0pt]{geometry} \begin{document} \[A_{km}(x)=2^{2^{2^{\iddots^{2^x}}}}\] \[A_{km}(x)=2^{2^{{\tikz[remember picture,minimum height=2mm] \node[inner sep=0.3pt] (n1) {$\scriptscriptstyle 2$};}^{\iddots^{{\tikz[remember picture] \node[inner sep=0.20pt] (n2) {$\scriptscriptstyle 2$};}^x}}}}\] \begin{tikzpicture}[remember picture,overlay] \draw[decorate,decoration={calligraphic brace,amplitude=0.5mm,,raise=3.2pt},ultra thick,line width=0.1mm] (n1.center) -- (n2.center) node[midway,sloped,above=1.5mm,scale=0.4] {$k\!$个}; \end{tikzpicture} \end{document} ```  求解更好的思路