| (Oral Ccp) Soit {M\!\in\!{\mathcal M}_{n}(\mathbb{R})} où {\begin{cases}m_{i,j}\!=\!1\text{\ si\ }j\!\in\!\{1,i,n\}\\m_{i,j}=0\text{\ sinon}\end{cases}}
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| (Oral Ccp) Soit {M\!\in\!{\mathcal M}_{n}(\mathbb{R})} où {\begin{cases}m_{i,j}\!=\!1\text{\ si\ }j\!\in\!\{1,i,n\}\\m_{i,j}=0\text{\ sinon}\end{cases}}
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