$\,-2\;(\,2\,-4\,x) = $   ?

$\,-4 \,-8\,\,x$ $\,-4 +\,4\,\,x$ $\,4 \,-6\,x$ $\,0 \,-6\,\,x$ $\,-4 +\,8\,\,x$ $\,-4 \,-4\,x$

$\,-2\,y\;(\,7\,x+\,4) = $   ?

$\,-14\,\,x\,y \,-8\,\,y$ $\,14\,\,x\,y \,-8$ $\,-14\,\,x\,y +\,8$ $\,-14\,\,x\,y +\,4$ $\,5\,\,x\,y +\,2\,\,y$ $\,-14\,x \,-2\,\,y$

$\,5\,y\;(\,4\,y+\,x) = $   ?

$\,20\,\,y^2 +\,x$ $\,9\,\,y^2 +\,6\,\,x\,y$ $\,20\,\,y^2 \,-5\,x$ $\,-20\,y +\,5\,\,x\,y$ $\,20\,\,y^2 +\,5\,\,x\,y$ $\,20\,\,y^2 +\,6\,\,x\,y$

$\,5\,b\;(\,7\,b+\,4\,a) = $   ?

$\,35\,\,b^2 \,-20\,a$ $\,35\,b +\,20\,\,a\,b$ $\,-35\,\,b^2 +\,9\,\,a\,b$ $\,12\,\,b^2 +\,9\,\,a\,b$ $\,35\,\,b^2 +\,20\,\,a\,b$ $\,35\,\,b^2 +\,4\,a$

$(\,b+\,6)\;(\,-1+\,5\,b) = $   ?

$\,5\,\,b^2 +\,29\,\,b +\,6$ $\,-5\,\,b^2 \,-31\,\,b \,-6$ $\,5\,\,b^2 +\,31\,\,b +\,6$ $\,5\,\,b^2 +\,29\,\,b \,-6$

$(\,x\,-2)\;(\,-\,y\,-5) = $   ?

$\,-\,\,x\,y +\,5\,\,x +\,2\,\,y +\,10$ $\,-\,\,x\,y \,-5\,\,x \,-2\,\,y \,-10$ $\,\,x\,y \,-5\,\,x \,-2\,\,y +\,10$ $\,-\,\,x\,y \,-5\,\,x +\,2\,\,y +\,10$

$(\,5\,-3\,t)\;(\,4\,t\,-2) = $   ?

$\,-12\,\,t^2 +\,26\,\,t +\,10$ $\,-12\,\,t^2 \,-26\,\,t \,-10$ $\,-12\,\,t^2 +\,14\,\,t \,-10$ $\,-12\,\,t^2 +\,26\,\,t \,-10$

Quelle est l'expression factorisée de $\,2\,\,t^2\;+\,7\,\,t$ ?

$\,t\;(\,2\,t\;+\,7\,\,t)$ $\,t\;(\,2\,t\;+\,7)$ $\,t\;(\,2\,t\;+\,6)$ $\,t\;(\,2\;+\,7\,t)$

Quelle est l'expression factorisée de $\,72\;\,-16\,\,b$ ?

$\,8\;(\,9\,b\;\,-16)$ $\,8\;(\,9\;\,-2\,b)$ $\,8\,b\;(\,9\;\,-2\,b)$ $\,8\;(\,9\;+\,2\,b)$

Quelle est l'expression factorisée de $\,16\,\,t\,y\;\,-6\,\,t^2$ ?

$\,2\,t\;(\,8\,y\;\,-3\,^{2})$ $\,2\,t\;(\,8\,y\;+\,3\,t)$ $\,2\,t\;(\,8\,y\;\,-3\,t)$ $\,2\,t\;(\,8\,t\;\,-6\,y)$