Produit par une matrice colonne

Exprimer le coefficient $c_{21}$ en fonction de $a$ dans le calcul suivant :
$\left(\begin{array}{cc},a& \end{array}\right)$ $[]$= $\left(\begin{array}{cc}{c}_{21}& \end{array}\right)$

$c_{21}$=

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coefficient =

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• Description: collection d'exercices simples sur la manipulation des matrices. Plateforme exercices academie Versailles
• Keywords: Euler, mathematiques, Versailles, linear_algebra, matrix, calcul matriciel, coefficients d'une matrice, produit de matrices