bị báo lỗi Number too big.... Ai khắc phục chỉ dùm cái. Xin cảm ơn

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\rfoot{Trang \thepage}
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\theoremstyle{definition}
\newtheorem*{cau1}{Câu 1}
\newtheorem*{cau2}{Câu 2}
\newtheorem*{cau3}{Câu 3}
\newtheorem*{cau4}{Câu 4}
\newtheorem*{cau5}{Câu 5}
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\newtheorem*{cau7}{Câu 7}
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\newtheorem*{cau9}{Câu 9}
\newtheorem*{cau10}{Câu 10}
\newtheorem*{cau11}{Câu 11}
\newtheorem*{cau12}{Câu 12}

\begin{document}

\begin{center}
\noindent \textbf{BÀI TẬP VỀ ĐỊNH LÝ PY-TA-GO}\\
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\begin{cau1}
Tìm độ dài x trên hình sau:\\
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\psline(2.38,2.1)(6.540792079207921,0.0920792079207925)
\psline(2.62,-0.3)(6.540792079207921,0.0920792079207925)
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\rput[tl](2.16,-0.28){A}
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\end{cau1}

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