\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Calculer la multiplication par un scalaire :
$$ 2\begin{pmatrix} \frac{1}{2} & 3 \\ -1 & 0 \end{pmatrix} = \begin{pmatrix}\input{14179}{}{3em}{2em}{}{} & \input{24179}{}{3em}{2em}{}{}\\ \input{34179}{}{3em}{2em}{}{} & \input{44179}{}{3em}{2em}{}{} \end{pmatrix}$$