$\,-4\;(\,2\,-4\,t) = $   ?

$\,-8 \,-16\,\,t$ $\,-8 +\,4\,\,t$ $\,-8 +\,16\,\,t$ $\,-8 \,-4\,t$ $\,8 \,-8\,t$ $\,-2 \,-8\,\,t$

$\,-6\,a\;(\,9+\,7\,b) = $   ?

$\,-54\,\,a \,-42\,\,a\,b$ $\,54 \,-42\,\,a\,b$ $\,-54 \,-\,\,a\,b$ $\,3\,\,a +\,\,a\,b$ $\,-54\,\,a +\,42\,b$ $\,-54\,\,a +\,7\,b$

$\,3\,x\;(\,9\,x+\,6\,y) = $   ?

$\,27\,\,x^2 +\,18\,\,x\,y$ $\,27\,\,x^2 +\,6\,y$ $\,27\,\,x^2 \,-18\,y$ $\,12\,\,x^2 +\,9\,\,x\,y$ $\,-27\,\,x^2 +\,9\,\,x\,y$ $\,27\,x +\,18\,\,x\,y$

$\,5\,t\;(\,2\,t+\,6\,x) = $   ?

$\,10\,\,t^2 \,-30\,x$ $\,10\,\,t^2 +\,11\,\,t\,x$ $\,10\,\,t^2 +\,30\,\,t\,x$ $\,7\,\,t^2 +\,11\,\,t\,x$ $\,10\,\,t^2 +\,6\,x$ $\,-10\,t +\,30\,\,t\,x$

$(\,1+\,6\,t)\;(\,-3\,t+\,4) = $   ?

$\,18\,\,t^2 +\,21\,\,t +\,4$ $\,-18\,\,t^2 +\,21\,\,t +\,4$ $\,-18\,\,t^2 \,-21\,\,t +\,4$ $\,-18\,\,t^2 \,-27\,\,t \,-4$

$(\,3\,-6\,b)\;(\,-4\,a\,-2) = $   ?

$\,-12\,\,a +\,6 +\,24\,\,a\,b +\,12\,\,b$ $\,-12\,\,a \,-6 \,-24\,\,a\,b \,-12\,\,b$ $\,-12\,\,a \,-6 +\,24\,\,a\,b +\,12\,\,b$ $\,12\,\,a \,-6 +\,24\,\,a\,b \,-12\,\,b$

$(\,2\,-\,a)\;(\,4\,a\,-1) = $   ?

$\,-4\,\,a^2 +\,7\,\,a +\,2$ $\,-4\,\,a^2 +\,9\,\,a \,-2$ $\,-4\,\,a^2 +\,7\,\,a \,-2$ $\,4\,\,a^2 \,-7\,\,a \,-2$

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

$\,t\;(\,2\,t\;+\,7)$ $\,t\;(\,2\,t\;+\,7\,\,t)$ $\,t\;(\,2\,^{2}\;+\,7)$ $\,t\;(\,2\,t\;+\,6)$

Quelle est l'expression factorisée de $\,32\,\,y\;\,-72$ ?

$\,8\;(\,-4\,y\;+\,9)$ $\,8\;(\,4\,y\;\,-9)$ $\,8\,y\;(\,4\,y\;\,-9)$ $\,8\;(\,4\,y\;+\,9)$

Quelle est l'expression factorisée de $\,24\,\,x\,y\;\,-54\,\,x^2$ ?

$\,6\,x\;(\,4\,y\;\,-9\,x)$ $\,6\,x\;(\,4\,y\;+\,x)$ $\,6\,x\;(\,4\,y\;\,-9\,^{2})$ $\,6\,\,x^2\;(\,4\,y\;\,-9)$