\documentclass[12pt,a4paper,landscape]{article}

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\usepackage{thmbox}%pour les jolis thm
\usepackage{array,multirow,tabularx}%pour les tableaux
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\usepackage{mathtools}%pour insérer le logo
\usepackage{bbold} %pour l'indicatrice
\usepackage{tocloft}%pour la mise en forme de la toc
\usepackage{tikz}%pour les graphiques et dessins

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\begin{document}
\Large
\renewcommand{\arraystretch}{2.9}

\begin{tabular}{@{}||*{4}{p{6.2cm}||}}
\hline\hline
\num$3 \times 11 \times 6 = 33 \times 6$ &
\num$(2+3) \times 5 = 5^2  $ &
\num$ (2+3)^2 \neq 2^2+3^2$ &
\num$(-1) \times (-2) = 2 $ \\
\hline\hline
\num$8000= 8 \times 10^3$&
\num$3^3 \times 10^2=27 \times 100$&
\num$\sqrt{4} = 2$ &
\num$ 2 \div 5 = \dfrac{2}{5} = 0,4$\\
\hline\hline
\diff
\num$ a^{n-p}=\dfrac{a^n}{a^p}$&
\num$ a^{n+p}=a^n \times a^p$&
\num$\Big(\sqrt{a+b}\Big)^2 =a +b $&
\num$\sqrt{(a+b)^2} =a +b $\\
\hline\hline
\num$(a+b)^2\! = a^2 +2ab +b^2$&
\num$(a-b)^2\! = a^2 -2ab +b^2$&
\num$ (a-b) (a+b) =a^2-b^2$&
\num$\dfrac{\sqrt{a}}{\sqrt{b}}=\sqrt{\dfrac{a}{b}}$\\
\hline\hline
\diff
\num$ 1 \leqslant 2$&
\num$ -1 \geqslant -2$&
\num$ 3\leqslant 4$&
\num$ \dfrac{1}{3} \geqslant \dfrac{1}{4}$\\
\hline\hline
\num$ 10 < 20$&
\num$ -10 > -30$&
\num$ x \neq y$&
\num$ \dfrac{1}{10} < \dfrac{1}{100}$\\
\hline\hline
\diff
\num$\dfrac{2^2-1}{3}=\dfrac{10}{10} =1$&
\num$\left(\dfrac{5x+3y}{2z}\right)^2 \geqslant 0$&
\num$\Delta = b^2 - 4 ac$&
\num$\dfrac{-b-\sqrt{\Delta}}{2a}$\\
\hline\hline
\diff
\num$\sum\limits_{i=1}^{n}x_i =\!\! \sum\limits_{i=1}^{n-1}x_i + x_n$&
\num$\sum\limits_{k=1}^{4}k=1+2+3+4$&
\num$\sum\limits_{i=1}^{n}x_i =\!\! \prod\limits_{i=1}^{n-1}x_i \times x_n$&
\num$\prod\limits_{k=1}^{4}k=1\times2\times3\times4$\\
\hline\hline
%\diff
%\num$ $$&
%\num$ $$&
%\num$ $$&
%\num$ $\\
%\hline\hline
\end{tabular}


\end{document}