$\,-5\;(\,8\,-7\,y) = $   ?

$\,-40 \,-7\,y$ $\,-40 +\,7\,\,y$ $\,-40 \,-12\,y$ $\,3 \,-12\,\,y$ $\,-40 \,-35\,\,y$ $\,-40 +\,35\,\,y$

$\,-4\,t\;(\,7\,x+\,1) = $   ?

$\,-28\,x +\,3\,\,t$ $\,-28\,\,t\,x +\,1$ $\,-28\,\,t\,x +\,4$ $\,28\,x \,-4\,\,t$ $\,-28\,\,t\,x \,-4\,\,t$ $\,3\,\,t\,x \,-3\,\,t$

$\,5\,b\;(\,-\,b+\,a) = $   ?

$\,5\,b +\,5\,\,a\,b$ $\,-5\,\,b^2 +\,5\,\,a\,b$ $\,4\,\,b^2 +\,6\,\,a\,b$ $\,-5\,\,b^2 +\,6\,\,a\,b$ $\,-5\,\,b^2 +\,a$ $\,-5\,\,b^2 \,-5\,a$

$\,4\,a\;(\,a+\,b) = $   ?

$\,4\,\,a^2 +\,5\,\,a\,b$ $\,5\,\,a^2 +\,5\,\,a\,b$ $\,4\,\,a^2 \,-4\,b$ $\,-4\,\,a^2 +\,4\,b$ $\,4\,\,a^2 +\,b$ $\,4\,\,a^2 +\,4\,\,a\,b$

$(\,5\,-\,a)\;(\,6+\,a) = $   ?

$\,\,a^2 \,-11\,\,a +\,30$ $\,\,a^2 \,-\,\,a +\,30$ $\,-\,\,a^2 +\,\,a +\,30$ $\,-\,\,a^2 \,-\,\,a +\,30$

$(\,a\,-2)\;(\,-\,b\,-4) = $   ?

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

$(\,2\,y+\,4)\;(\,-4\,y\,-5) = $   ?

$\,8\,\,y^2 \,-26\,\,y \,-20$ $\,8\,\,y^2 +\,6\,\,y \,-20$ $\,-8\,\,y^2 \,-26\,\,y \,-20$ $\,-8\,\,y^2 +\,26\,\,y \,-20$

Quelle est l'expression factorisée de $\,2\,\,a\;+\,3\,\,a^2$ ?

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

Quelle est l'expression factorisée de $\,-45\,\,t\;+\,54$ ?

$\,9\,t\;(\,-5\,t\;+\,6)$ $\,9\;(\,-5\;+\,54\,t)$ $\,9\;(\,-5\,t\;+\,54)$ $\,9\;(\,-5\,t\;+\,6)$

Quelle est l'expression factorisée de $\,-12\,\,b^2\;+\,6\,\,a\,b$ ?

$\,6\,b\;(\,-2\,b\;+\,\,a\,b)$ $\,6\,b\;(\,-2\,b\;+\,a)$ $\,6\,\,b^2\;(\,-2\;+\,a)$ $\,6\,b\;(\,2\,b\;+\,a)$