$\,-5\;(\,-\,b\,-8) = $   ?

$\,5\,\,b \,-40$ $\,5\,\,b \,-8$ $\,-6\,\,b \,-13$ $\,5\,\,b \,-13$ $\,5\,\,b +\,8$ $\,5\,\,b +\,40$

$\,-4\,b\;(\,-8\,-3\,a) = $   ?

$\,32\,\,b \,-12\,a$ $\,32 +\,12\,\,a\,b$ $\,-12\,\,b \,-7\,\,a\,b$ $\,-32\,\,b \,-7\,a$ $\,32\,\,b +\,12\,\,a\,b$ $\,32\,\,b \,-3\,a$

$\,4\,x\;(\,5\,x+\,3\,y) = $   ?

$\,9\,\,x^2 +\,7\,\,x\,y$ $\,20\,\,x^2 +\,7\,\,x\,y$ $\,20\,\,x^2 +\,12\,\,x\,y$ $\,-20\,\,x^2 +\,12\,y$ $\,20\,\,x^2 \,-12\,y$ $\,20\,\,x^2 +\,3\,y$

$\,4\,y\;(\,6\,y+\,6\,x) = $   ?

$\,24\,\,y^2 +\,24\,\,x\,y$ $\,24\,\,y^2 +\,10\,\,x\,y$ $\,10\,\,y^2 +\,10\,\,x\,y$ $\,-24\,y +\,24\,\,x\,y$ $\,24\,\,y^2 \,-24\,x$ $\,24\,\,y^2 +\,6\,x$

$(\,3+\,a)\;(\,2\,a\,-6) = $   ?

$\,2\,\,a^2 +\,12\,\,a +\,18$ $\,2\,\,a^2 \,-12\,\,a +\,18$ $\,-2\,\,a^2 \,-18$ $\,2\,\,a^2 \,-18$

$(\,y\,-2)\;(\,-2\,-3\,x) = $   ?

$\,-2\,\,y +\,3\,\,x\,y +\,4 \,-6\,\,x$ $\,-2\,\,y \,-3\,\,x\,y +\,4 +\,6\,\,x$ $\,-2\,\,y +\,3\,\,x\,y +\,4 +\,6\,\,x$ $\,-2\,\,y \,-3\,\,x\,y +\,4 \,-6\,\,x$

$(\,4\,-\,x)\;(\,-6+\,4\,x) = $   ?

$\,4\,\,x^2 \,-10\,\,x \,-24$ $\,4\,\,x^2 +\,10\,\,x \,-24$ $\,-4\,\,x^2 +\,22\,\,x \,-24$ $\,-4\,\,x^2 +\,10\,\,x +\,24$

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

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

Quelle est l'expression factorisée de $\,15\;\,-5\,\,t$ ?

$\,5\;(\,3\,t\;\,-5)$ $\,5\;(\,-3\;+\,t)$ $\,5\;(\,3\;\,-\,t)$ $\,5\;(\,3\;+\,t)$

Quelle est l'expression factorisée de $\,20\,\,y^2\;\,-25\,\,x\,y$ ?

$\,5\,y\;(\,4\,y\;+\,x)$ $\,5\,y\;(\,4\,y\;\,-5\,x)$ $\,5\,y\;(\,4\,y\;\,-25\,x)$ $\,5\,\,y^2\;(\,4\;\,-5\,x)$