$\,-5\;(\,-\,b\,-8) = $   ?

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

$\,-6\,a\;(\,-8\,-8\,b) = $   ?

$\,48\,\,a \,-14\,b$ $\,48\,\,a \,-48\,b$ $\,-14\,\,a \,-14\,\,a\,b$ $\,48\,\,a +\,48\,\,a\,b$ $\,48\,\,a \,-8\,b$ $\,-48\,\,a +\,48\,b$

$\,2\,b\;(\,6\,b+\,9\,a) = $   ?

$\,12\,\,b^2 +\,9\,a$ $\,-12\,\,b^2 +\,18\,a$ $\,12\,\,b^2 +\,11\,\,a\,b$ $\,12\,\,b^2 \,-18\,a$ $\,12\,\,b^2 +\,18\,\,a\,b$ $\,8\,\,b^2 +\,11\,\,a\,b$

$\,6\,t\;(\,8\,t\,-2\,x) = $   ?

$\,14\,\,t^2 +\,4\,\,t\,x$ $\,48\,\,t^2 +\,12\,x$ $\,-48\,\,t^2 \,-12\,x$ $\,48\,\,t^2 \,-2\,x$ $\,48\,\,t^2 \,-12\,\,t\,x$ $\,48\,\,t^2 +\,4\,x$

$(\,6\,-6\,t)\;(\,5+\,t) = $   ?

$\,6\,\,t^2 \,-36\,\,t +\,30$ $\,-6\,\,t^2 +\,24\,\,t +\,30$ $\,-6\,\,t^2 \,-36\,\,t \,-30$ $\,-6\,\,t^2 \,-24\,\,t +\,30$

$(\,4\,-\,t)\;(\,-3\,-4\,x) = $   ?

$\,-12 \,-16\,\,x +\,3\,\,t +\,4\,\,t\,x$ $\,12 \,-16\,\,x +\,3\,\,t +\,4\,\,t\,x$ $\,12 \,-16\,\,x \,-3\,\,t +\,4\,\,t\,x$ $\,12 +\,16\,\,x +\,3\,\,t +\,4\,\,t\,x$

$(\,1+\,b)\;(\,-\,b\,-2) = $   ?

$\,-\,\,b^2 \,-3\,\,b \,-2$ $\,-\,\,b^2 \,-\,\,b +\,2$ $\,\,b^2 +\,\,b \,-2$ $\,-\,\,b^2 +\,3\,\,b \,-2$

Quelle est l'expression factorisée de $\,3\,\,t^2\;+\,\,t$ ?

$\,t\;(\,3\,t\;+\,\,t)$ $\,t\;(\,3\,^{2}\;+\,1)$ $\,t\;(\,3\,t\;+\,1)$ $\,t\;(\,3\;+\,t)$

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

$\,6\;(\,4\,x\;\,-9)$ $\,6\;(\,4\;\,-54\,x)$ $\,6\,x\;(\,4\,x\;\,-9)$ $\,6\;(\,4\,x\;+\,9)$

Quelle est l'expression factorisée de $\,-12\,\,y^2\;+\,42\,\,x\,y$ ?

$\,6\,y\;(\,-2\,y\;+\,7\,x)$ $\,6\,y\;(\,-2\,y\;+\,7\,\,x\,y)$ $\,6\,y\;(\,-2\,^{2}\;+\,7\,x)$ $\,6\,y\;(\,2\,y\;+\,7\,x)$