$\,-5\;(\,-9\,-7\,x) = $   ?

$\,-14 \,-12\,\,x$ $\,45 +\,7\,\,x$ $\,45 +\,35\,\,x$ $\,-45 \,-12\,x$ $\,45 \,-35\,\,x$ $\,45 \,-7\,x$

$\,-3\,t\;(\,2\,x+\,1) = $   ?

$\,6\,x +\,2\,\,t$ $\,-6\,\,t\,x \,-3\,\,t$ $\,-6\,\,t\,x +\,3$ $\,-6\,\,t\,x +\,1$ $\,-6\,\,t\,x \,-3$ $\,-\,\,t\,x \,-2\,\,t$

$\,5\,b\;(\,6\,b+\,7\,a) = $   ?

$\,30\,b +\,35\,\,a\,b$ $\,11\,\,b^2 +\,12\,\,a\,b$ $\,-30\,\,b^2 +\,12\,\,a\,b$ $\,30\,\,b^2 +\,35\,\,a\,b$ $\,30\,\,b^2 +\,7\,a$ $\,30\,\,b^2 \,-35\,a$

$\,4\,b\;(\,4\,b+\,5\,a) = $   ?

$\,16\,\,b^2 +\,5\,a$ $\,8\,\,b^2 +\,9\,\,a\,b$ $\,16\,\,b^2 +\,20\,\,a\,b$ $\,-16\,\,b^2 +\,9\,\,a\,b$ $\,16\,\,b^2 +\,20\,a$ $\,16\,\,b^2 \,-20\,a$

$(\,2+\,5\,t)\;(\,-\,t+\,6) = $   ?

$\,-5\,\,t^2 \,-28\,\,t +\,12$ $\,-5\,\,t^2 +\,28\,\,t +\,12$ $\,-5\,\,t^2 +\,28\,\,t \,-12$ $\,-5\,\,t^2 +\,32\,\,t +\,12$

$(\,b\,-5)\;(\,-3\,a\,-2) = $   ?

$\,-3\,\,a\,b +\,2\,\,b +\,15\,\,a +\,10$ $\,3\,\,a\,b +\,2\,\,b +\,15\,\,a +\,10$ $\,-3\,\,a\,b +\,2\,\,b +\,15\,\,a \,-10$ $\,-3\,\,a\,b \,-2\,\,b +\,15\,\,a +\,10$

$(\,b\,-3)\;(\,-6+\,4\,b) = $   ?

$\,4\,\,b^2 \,-18\,\,b +\,18$ $\,-4\,\,b^2 \,-18\,\,b \,-18$ $\,-4\,\,b^2 +\,6\,\,b +\,18$ $\,4\,\,b^2 +\,18\,\,b +\,18$

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

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

Quelle est l'expression factorisée de $\,-24\,\,a\;+\,4$ ?

$\,4\;(\,-6\,a\;+\,1)$ $\,4\;(\,-6\;+\,4\,a)$ $\,4\,a\;(\,-6\,a\;+\,1)$ $\,4\;(\,6\,a\;+\,1)$

Quelle est l'expression factorisée de $\,-24\,\,t^2\;+\,20\,\,t\,y$ ?

$\,4\,t\;(\,-6\,t\;+\,5\,\,t\,y)$ $\,4\,t\;(\,-6\,t\;+\,5\,y)$ $\,4\,t\;(\,-6\,y\;+\,20\,t)$ $\,4\,t\;(\,-6\,^{2}\;+\,5\,y)$