$\,-3\;(\,-8\,x\,-2) = $   ?

$\,-24\,\,x \,-5$ $\,24\,\,x \,-2$ $\,-11\,\,x \,-5$ $\,24\,\,x +\,2$ $\,24\,\,x \,-6$ $\,24\,\,x +\,6$

$\,-5\,t\;(\,-7\,x\,-5) = $   ?

$\,35\,\,t\,x \,-5$ $\,-35\,x +\,25\,\,t$ $\,-12\,\,t\,x \,-10\,\,t$ $\,35\,\,t\,x \,-25$ $\,35\,\,t\,x \,-10$ $\,35\,\,t\,x +\,25\,\,t$

$\,3\,y\;(\,7\,y+\,8\,x) = $   ?

$\,21\,y +\,24\,\,x\,y$ $\,21\,\,y^2 +\,24\,\,x\,y$ $\,21\,\,y^2 +\,8\,x$ $\,21\,\,y^2 \,-24\,x$ $\,10\,\,y^2 +\,11\,\,x\,y$ $\,-21\,\,y^2 +\,11\,\,x\,y$

$\,5\,x\;(\,-5\,x\,-9\,y) = $   ?

$\,-25\,\,x^2 +\,45\,y$ $\,-25\,\,x^2 \,-4\,y$ $\,25\,x \,-45\,\,x\,y$ $\,-25\,\,x^2 \,-9\,y$ $\,-25\,\,x^2 \,-45\,\,x\,y$ $\,0\,\,x^2 \,-4\,\,x\,y$

$(\,6\,-6\,b)\;(\,b+\,2) = $   ?

$\,-6\,\,b^2 \,-6\,\,b +\,12$ $\,-6\,\,b^2 +\,6\,\,b +\,12$ $\,-6\,\,b^2 \,-6\,\,b \,-12$ $\,6\,\,b^2 +\,18\,\,b +\,12$

$(\,2\,-6\,x)\;(\,-1\,-4\,y) = $   ?

$\,2 \,-8\,\,y +\,6\,\,x \,-24\,\,x\,y$ $\,-2 \,-8\,\,y +\,6\,\,x +\,24\,\,x\,y$ $\,-2 \,-8\,\,y \,-6\,\,x \,-24\,\,x\,y$ $\,-2 +\,8\,\,y +\,6\,\,x +\,24\,\,x\,y$

$(\,1\,-4\,y)\;(\,-4+\,y) = $   ?

$\,-4\,\,y^2 +\,17\,\,y \,-4$ $\,-4\,\,y^2 +\,15\,\,y \,-4$ $\,-4\,\,y^2 \,-15\,\,y \,-4$ $\,4\,\,y^2 +\,15\,\,y \,-4$

Quelle est l'expression factorisée de $\,5\,\,a^2\;+\,\,a$ ?

$\,a\;(\,5\;+\,a)$ $\,a\;(\,5\,a\;+\,\,a)$ $\,a\;(\,5\,^{2}\;+\,1)$ $\,a\;(\,5\,a\;+\,1)$

Quelle est l'expression factorisée de $\,40\,\,b\;\,-64$ ?

$\,8\;(\,5\,b\;\,-8)$ $\,8\;(\,5\,b\;\,-64)$ $\,8\,b\;(\,5\,b\;\,-8)$ $\,8\;(\,5\;\,-64\,b)$

Quelle est l'expression factorisée de $\,-40\,\,x\,y\;+\,5\,\,y^2$ ?

$\,5\,y\;(\,-8\,x\;+\,^{2})$ $\,5\,y\;(\,-8\,x\;+\,y)$ $\,5\,\,y^2\;(\,-8\,x\;+\,1)$ $\,5\,y\;(\,-8\,x\;+\,\,y^2)$