$\,-6\;(\,-4\,-2\,x) = $   ?

$\,24 \,-2\,x$ $\,24 \,-8\,x$ $\,24 +\,2\,\,x$ $\,24 +\,12\,\,x$ $\,24 \,-12\,\,x$ $\,-10 \,-8\,\,x$

$\,-4\,x\;(\,8\,y\,-4) = $   ?

$\,-32\,\,x\,y \,-16$ $\,4\,\,x\,y \,-8\,\,x$ $\,-32\,\,x\,y +\,16$ $\,-32\,\,x\,y +\,16\,\,x$ $\,-32\,\,x\,y \,-4$ $\,32\,\,x\,y \,-8$

$\,6\,x\;(\,-4\,x+\,9\,y) = $   ?

$\,-24\,\,x^2 \,-54\,y$ $\,24\,x +\,54\,\,x\,y$ $\,-24\,\,x^2 +\,54\,\,x\,y$ $\,2\,\,x^2 +\,15\,\,x\,y$ $\,-24\,\,x^2 +\,9\,y$ $\,-24\,\,x^2 +\,15\,\,x\,y$

$\,5\,x\;(\,x\,-4\,y) = $   ?

$\,5\,\,x^2 +\,20\,y$ $\,6\,\,x^2 +\,\,x\,y$ $\,5\,\,x^2 \,-20\,\,x\,y$ $\,-5\,\,x^2 \,-20\,y$ $\,5\,\,x^2 +\,y$ $\,5\,\,x^2 \,-4\,y$

$(\,5+\,4\,y)\;(\,y\,-1) = $   ?

$\,4\,\,y^2 +\,9\,\,y \,-5$ $\,4\,\,y^2 \,-9\,\,y \,-5$ $\,4\,\,y^2 +\,9\,\,y +\,5$ $\,4\,\,y^2 +\,\,y \,-5$

$(\,t\,-4)\;(\,-4\,-\,x) = $   ?

$\,-4\,\,t \,-\,\,t\,x +\,16 +\,4\,\,x$ $\,4\,\,t \,-\,\,t\,x +\,16 \,-4\,\,x$ $\,-4\,\,t \,-\,\,t\,x +\,16 \,-4\,\,x$ $\,-4\,\,t +\,\,t\,x +\,16 +\,4\,\,x$

$(\,3\,x+\,5)\;(\,-\,x\,-6) = $   ?

$\,-3\,\,x^2 \,-23\,\,x \,-30$ $\,-3\,\,x^2 \,-23\,\,x +\,30$ $\,-3\,\,x^2 \,-13\,\,x \,-30$ $\,3\,\,x^2 +\,13\,\,x \,-30$

Quelle est l'expression factorisée de $\,8\,\,x\;+\,9\,\,x^2$ ?

$\,x\;(\,8\;+\,9\,\,x^2)$ $\,x\;(\,8\;+\,x)$ $\,x\;(\,8\;+\,9\,x)$ $\,x\;(\,8\,x\;+\,9)$

Quelle est l'expression factorisée de $\,-40\;+\,64\,\,t$ ?

$\,8\;(\,-5\,t\;+\,64)$ $\,8\;(\,-5\;+\,64\,t)$ $\,8\;(\,-5\;+\,8\,t)$ $\,8\,t\;(\,-5\;+\,8\,t)$

Quelle est l'expression factorisée de $\,-72\,\,x\,y\;+\,63\,\,y^2$ ?

$\,9\,y\;(\,-8\,x\;+\,7\,^{2})$ $\,9\,y\;(\,-8\,x\;+\,y)$ $\,9\,y\;(\,-8\,x\;+\,7\,y)$ $\,9\,y\;(\,8\,x\;\,-7\,y)$