$\,-6\;(\,-4\,t\,-1) = $   ?

$\,-10\,\,t \,-7$ $\,-24\,\,t \,-7$ $\,24\,\,t \,-6$ $\,24\,\,t +\,6$ $\,24\,\,t \,-1$ $\,24\,\,t +\,1$

$\,-3\,a\;(\,7\,b\,-4) = $   ?

$\,21\,b +\,12\,\,a$ $\,4\,\,a\,b \,-7\,\,a$ $\,-21\,\,a\,b \,-12$ $\,-21\,\,a\,b +\,12\,\,a$ $\,-21\,\,a\,b \,-4$ $\,-21\,\,a\,b \,-7$

$\,2\,x\;(\,8\,x+\,9\,y) = $   ?

$\,10\,\,x^2 +\,11\,\,x\,y$ $\,16\,\,x^2 +\,11\,\,x\,y$ $\,16\,\,x^2 \,-18\,y$ $\,-16\,\,x^2 +\,18\,y$ $\,16\,\,x^2 +\,18\,\,x\,y$ $\,16\,\,x^2 +\,9\,y$

$\,6\,b\;(\,8\,b+\,8\,a) = $   ?

$\,48\,\,b^2 +\,48\,\,a\,b$ $\,-48\,\,b^2 +\,48\,a$ $\,48\,\,b^2 +\,14\,\,a\,b$ $\,14\,\,b^2 +\,14\,\,a\,b$ $\,48\,\,b^2 \,-48\,a$ $\,48\,\,b^2 +\,8\,a$

$(\,2+\,x)\;(\,1\,-2\,x) = $   ?

$\,-2\,\,x^2 \,-3\,\,x +\,2$ $\,-2\,\,x^2 +\,3\,\,x +\,2$ $\,2\,\,x^2 \,-3\,\,x \,-2$ $\,-2\,\,x^2 \,-5\,\,x +\,2$

$(\,6\,t\,-3)\;(\,-5\,-6\,x) = $   ?

$\,-30\,\,t \,-36\,\,t\,x +\,15 +\,18\,\,x$ $\,-30\,\,t \,-36\,\,t\,x +\,15 \,-18\,\,x$ $\,30\,\,t \,-36\,\,t\,x +\,15 \,-18\,\,x$ $\,-30\,\,t \,-36\,\,t\,x \,-15 +\,18\,\,x$

$(\,a\,-4)\;(\,-\,a+\,1) = $   ?

$\,\,a^2 +\,3\,\,a \,-4$ $\,-\,\,a^2 \,-3\,\,a \,-4$ $\,-\,\,a^2 +\,3\,\,a \,-4$ $\,-\,\,a^2 +\,5\,\,a \,-4$

Quelle est l'expression factorisée de $\,9\,\,a\;+\,\,a^2$ ?

$\,a\;(\,9\;+\,\,a^2)$ $\,a\;(\,9\,a\;+\,1)$ $\,a\;(\,9\;+\,^{2})$ $\,a\;(\,9\;+\,a)$

Quelle est l'expression factorisée de $\,-10\,\,y\;+\,12$ ?

$\,2\,y\;(\,-5\,y\;+\,6)$ $\,2\;(\,5\,y\;+\,6)$ $\,2\;(\,-5\,y\;+\,6)$ $\,2\;(\,-5\;+\,12\,y)$

Quelle est l'expression factorisée de $\,15\,\,t\,y\;\,-10\,\,t^2$ ?

$\,5\,t\;(\,3\,y\;\,-2\,t)$ $\,5\,t\;(\,3\,y\;+\,2\,t)$ $\,5\,t\;(\,3\,y\;+\,t)$ $\,5\,t\;(\,3\,y\;\,-2\,\,t^2)$