$\,-4\;(\,5\,a\,-6) = $   ?

$\,-20\,\,a +\,24$ $\,-20\,\,a +\,6$ $\,-20\,\,a \,-24$ $\,\,a \,-10$ $\,-20\,\,a \,-6$ $\,20\,\,a \,-10$

$\,-2\,a\;(\,7+\,3\,b) = $   ?

$\,-14\,\,a +\,3\,b$ $\,-14\,\,a +\,6\,b$ $\,14\,\,a \,-6\,b$ $\,-14\,\,a \,-6\,\,a\,b$ $\,5\,\,a +\,\,a\,b$ $\,-14 \,-\,\,a\,b$

$\,3\,x\;(\,-2\,x+\,2\,y) = $   ?

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

$\,6\,a\;(\,-9\,a+\,6\,b) = $   ?

$\,-54\,\,a^2 +\,36\,b$ $\,-3\,\,a^2 +\,12\,\,a\,b$ $\,-54\,\,a^2 +\,6\,b$ $\,54\,\,a^2 +\,12\,\,a\,b$ $\,-54\,\,a^2 +\,36\,\,a\,b$ $\,-54\,\,a^2 \,-36\,b$

$(\,4\,x+\,5)\;(\,5\,x\,-1) = $   ?

$\,-20\,\,x^2 +\,21\,\,x \,-5$ $\,20\,\,x^2 +\,21\,\,x \,-5$ $\,20\,\,x^2 +\,29\,\,x \,-5$ $\,-20\,\,x^2 +\,21\,\,x +\,5$

$(\,b\,-4)\;(\,-\,a\,-2) = $   ?

$\,-\,\,a\,b \,-2\,\,b +\,4\,\,a +\,8$ $\,-\,\,a\,b \,-2\,\,b \,-4\,\,a +\,8$ $\,\,a\,b +\,2\,\,b +\,4\,\,a +\,8$ $\,-\,\,a\,b \,-2\,\,b +\,4\,\,a \,-8$

$(\,1\,-3\,a)\;(\,a\,-1) = $   ?

$\,-3\,\,a^2 \,-2\,\,a \,-1$ $\,3\,\,a^2 +\,2\,\,a \,-1$ $\,3\,\,a^2 +\,4\,\,a \,-1$ $\,-3\,\,a^2 +\,4\,\,a \,-1$

Quelle est l'expression factorisée de $\,3\,\,t\;+\,7\,\,t^2$ ?

$\,t\;(\,3\;+\,t)$ $\,t\;(\,3\;+\,7\,t)$ $\,t\;(\,3\;+\,7\,^{2})$ $\,t\;(\,3\;+\,7\,\,t^2)$

Quelle est l'expression factorisée de $\,-15\;+\,18\,\,y$ ?

$\,3\,y\;(\,-5\;+\,6\,y)$ $\,3\;(\,5\;+\,6\,y)$ $\,3\;(\,-5\;+\,6\,y)$ $\,3\;(\,5\;\,-6\,y)$

Quelle est l'expression factorisée de $\,-35\,\,t^2\;+\,49\,\,t\,y$ ?

$\,7\,t\;(\,-5\,t\;+\,49\,y)$ $\,7\,t\;(\,-5\,y\;+\,49\,t)$ $\,7\,t\;(\,-5\,t\;+\,7\,y)$ $\,7\,t\;(\,-5\,t\;+\,7\,\,t\,y)$