$\,-5\;(\,9\,-4\,a) = $   ?

$\,-45 +\,4\,\,a$ $\,-45 \,-20\,\,a$ $\,-45 +\,20\,\,a$ $\,45 \,-9\,a$ $\,4 \,-9\,\,a$ $\,-45 \,-4\,a$

$\,-2\,b\;(\,2\,a\,-4) = $   ?

$\,0\,\,a\,b \,-6\,\,b$ $\,-4\,\,a\,b \,-8$ $\,4\,\,a\,b +\,8$ $\,-4\,\,a\,b \,-6$ $\,-4\,\,a\,b +\,8\,\,b$ $\,-4\,\,a\,b \,-4$

$\,5\,a\;(\,-9\,a+\,3\,b) = $   ?

$\,-45\,\,a^2 +\,15\,\,a\,b$ $\,-45\,\,a^2 \,-15\,b$ $\,-45\,\,a^2 +\,8\,\,a\,b$ $\,45\,\,a^2 +\,15\,b$ $\,-45\,\,a^2 +\,3\,b$ $\,-4\,\,a^2 +\,8\,\,a\,b$

$\,4\,y\;(\,2\,y\,-6\,x) = $   ?

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

$(\,6+\,4\,x)\;(\,-4\,x+\,3) = $   ?

$\,-16\,\,x^2 \,-12\,\,x +\,18$ $\,16\,\,x^2 \,-36\,\,x +\,18$ $\,-16\,\,x^2 \,-12\,\,x \,-18$ $\,-16\,\,x^2 +\,36\,\,x +\,18$

$(\,2\,b\,-2)\;(\,-6\,a\,-1) = $   ?

$\,-12\,\,a\,b \,-2\,\,b +\,12\,\,a +\,2$ $\,-12\,\,a\,b +\,2\,\,b +\,12\,\,a \,-2$ $\,-12\,\,a\,b \,-2\,\,b \,-12\,\,a \,-2$ $\,12\,\,a\,b \,-2\,\,b +\,12\,\,a +\,2$

$(\,5\,-2\,t)\;(\,-6+\,t) = $   ?

$\,-2\,\,t^2 +\,17\,\,t +\,30$ $\,-2\,\,t^2 +\,17\,\,t \,-30$ $\,2\,\,t^2 \,-7\,\,t \,-30$ $\,-2\,\,t^2 \,-7\,\,t \,-30$

Quelle est l'expression factorisée de $\,3\,\,a\;+\,4\,\,a^2$ ?

$\,a\;(\,3\;+\,4\,a)$ $\,a\;(\,3\;+\,3\,a)$ $\,a\;(\,3\;+\,4\,\,a^2)$ $\,a\;(\,3\;+\,4\,^{2})$

Quelle est l'expression factorisée de $\,-8\,\,x\;+\,40$ ?

$\,8\;(\,x\;+\,5)$ $\,8\,x\;(\,-\,x\;+\,5)$ $\,8\;(\,-\,x\;+\,5)$ $\,8\;(\,-1\;+\,40\,x)$

Quelle est l'expression factorisée de $\,-36\,\,t^2\;+\,6\,\,t\,y$ ?

$\,6\,t\;(\,-6\,^{2}\;+\,y)$ $\,6\,t\;(\,6\,t\;+\,y)$ $\,6\,t\;(\,-6\,t\;+\,y)$ $\,6\,t\;(\,-6\,t\;+\,\,t\,y)$