$\,-6\;(\,2\,-9\,t) = $   ?

$\,-12 \,-54\,\,t$ $\,-12 +\,54\,\,t$ $\,-4 \,-15\,\,t$ $\,-12 \,-9\,t$ $\,-12 +\,9\,\,t$ $\,-12 \,-15\,t$

$\,-2\,x\;(\,-8\,y\,-6) = $   ?

$\,16\,\,x\,y +\,12\,\,x$ $\,-16\,\,x\,y +\,12$ $\,-10\,\,x\,y \,-8\,\,x$ $\,16\,\,x\,y \,-12$ $\,16\,\,x\,y \,-8$ $\,16\,\,x\,y \,-6$

$\,6\,a\;(\,-6\,a+\,9\,b) = $   ?

$\,0\,\,a^2 +\,15\,\,a\,b$ $\,36\,\,a^2 +\,54\,b$ $\,-36\,\,a^2 +\,54\,\,a\,b$ $\,-36\,\,a^2 +\,9\,b$ $\,-36\,\,a^2 +\,15\,\,a\,b$ $\,-36\,\,a^2 \,-54\,b$

$\,4\,a\;(\,5\,a\,-9\,b) = $   ?

$\,20\,\,a^2 +\,36\,b$ $\,20\,\,a^2 \,-36\,\,a\,b$ $\,9\,\,a^2 \,-5\,\,a\,b$ $\,20\,\,a^2 \,-36\,b$ $\,20\,\,a^2 \,-9\,b$ $\,-20\,\,a^2 \,-5\,b$

$(\,2+\,6\,b)\;(\,5\,-4\,b) = $   ?

$\,-24\,\,b^2 +\,38\,\,b +\,10$ $\,24\,\,b^2 +\,38\,\,b +\,10$ $\,24\,\,b^2 +\,22\,\,b \,-10$ $\,-24\,\,b^2 +\,22\,\,b +\,10$

$(\,b\,-4)\;(\,-4\,-\,a) = $   ?

$\,-4\,\,b \,-\,\,a\,b +\,16 +\,4\,\,a$ $\,-4\,\,b +\,\,a\,b +\,16 +\,4\,\,a$ $\,4\,\,b +\,\,a\,b +\,16 +\,4\,\,a$ $\,-4\,\,b \,-\,\,a\,b \,-16 +\,4\,\,a$

$(\,1\,-\,t)\;(\,-3+\,t) = $   ?

$\,\,t^2 +\,4\,\,t \,-3$ $\,-\,\,t^2 +\,4\,\,t \,-3$ $\,\,t^2 +\,4\,\,t +\,3$ $\,-\,\,t^2 \,-2\,\,t \,-3$

Quelle est l'expression factorisée de $\,8\,\,t^2\;+\,5\,\,t$ ?

$\,t\;(\,8\,t\;+\,5\,\,t)$ $\,t\;(\,8\,t\;+\,4)$ $\,t\;(\,8\,^{2}\;+\,5)$ $\,t\;(\,8\,t\;+\,5)$

Quelle est l'expression factorisée de $\,8\;\,-12\,\,x$ ?

$\,4\;(\,2\;+\,3\,x)$ $\,4\;(\,2\;\,-12\,x)$ $\,4\;(\,2\;+\,x)$ $\,4\;(\,2\;\,-3\,x)$

Quelle est l'expression factorisée de $\,36\,\,b^2\;\,-4\,\,a\,b$ ?

$\,4\,b\;(\,9\,a\;\,-4\,b)$ $\,4\,b\;(\,-9\,b\;+\,a)$ $\,4\,\,b^2\;(\,9\;\,-\,a)$ $\,4\,b\;(\,9\,b\;\,-\,a)$