$\,-2\;(\,-7\,-8\,x) = $   ?

$\,14 +\,8\,\,x$ $\,14 +\,16\,\,x$ $\,-9 \,-10\,\,x$ $\,14 \,-16\,\,x$ $\,14 \,-8\,x$ $\,14 \,-10\,x$

$\,-3\,t\;(\,7+\,8\,x) = $   ?

$\,-21\,\,t \,-24\,\,t\,x$ $\,-21\,\,t +\,8\,x$ $\,4\,\,t +\,5\,\,t\,x$ $\,21 \,-24\,\,t\,x$ $\,-21\,\,t +\,24\,x$ $\,-21 \,-5\,\,t\,x$

$\,6\,x\;(\,4\,x+\,8\,y) = $   ?

$\,24\,\,x^2 +\,48\,y$ $\,-24\,\,x^2 +\,14\,\,x\,y$ $\,10\,\,x^2 +\,14\,\,x\,y$ $\,24\,\,x^2 \,-48\,y$ $\,24\,\,x^2 +\,48\,\,x\,y$ $\,24\,\,x^2 +\,8\,y$

$\,5\,y\;(\,-2\,y+\,7\,x) = $   ?

$\,-10\,\,y^2 \,-35\,x$ $\,10\,\,y^2 +\,12\,\,x\,y$ $\,-10\,\,y^2 +\,35\,\,x\,y$ $\,-10\,y +\,35\,\,x\,y$ $\,-10\,\,y^2 +\,7\,x$ $\,3\,\,y^2 +\,12\,\,x\,y$

$(\,2\,-\,a)\;(\,5+\,4\,a) = $   ?

$\,-4\,\,a^2 +\,13\,\,a \,-10$ $\,-4\,\,a^2 \,-3\,\,a +\,10$ $\,-4\,\,a^2 +\,13\,\,a +\,10$ $\,-4\,\,a^2 +\,3\,\,a +\,10$

$(\,4\,b\,-2)\;(\,-3\,a\,-5) = $   ?

$\,12\,\,a\,b \,-20\,\,b \,-6\,\,a +\,10$ $\,12\,\,a\,b \,-20\,\,b +\,6\,\,a \,-10$ $\,-12\,\,a\,b \,-20\,\,b +\,6\,\,a +\,10$ $\,-12\,\,a\,b +\,20\,\,b \,-6\,\,a +\,10$

$(\,5+\,b)\;(\,-6\,-5\,b) = $   ?

$\,-5\,\,b^2 +\,31\,\,b \,-30$ $\,5\,\,b^2 +\,19\,\,b \,-30$ $\,-5\,\,b^2 +\,19\,\,b +\,30$ $\,-5\,\,b^2 \,-31\,\,b \,-30$

Quelle est l'expression factorisée de $\,9\,\,x\;+\,7\,\,x^2$ ?

$\,x\;(\,9\;+\,6\,x)$ $\,x\;(\,9\;+\,7\,x)$ $\,x\;(\,9\;+\,x)$ $\,x\;(\,9\;+\,7\,\,x^2)$

Quelle est l'expression factorisée de $\,40\;\,-16\,\,x$ ?

$\,8\;(\,5\;+\,x)$ $\,8\;(\,-5\;+\,2\,x)$ $\,8\;(\,5\;\,-16\,x)$ $\,8\;(\,5\;\,-2\,x)$

Quelle est l'expression factorisée de $\,72\,\,a\,b\;\,-9\,\,a^2$ ?

$\,9\,a\;(\,8\,b\;+\,a)$ $\,9\,a\;(\,8\,a\;\,-9\,b)$ $\,9\,a\;(\,8\,b\;\,-\,a)$ $\,9\,a\;(\,8\,b\;\,-9\,a)$