$\,-3\;(\,9\,t\,-2) = $   ?

$\,-27\,\,t +\,2$ $\,-27\,\,t \,-2$ $\,-27\,\,t \,-5$ $\,6\,\,t \,-5$ $\,-27\,\,t +\,6$ $\,-27\,\,t \,-6$

$\,-6\,t\;(\,6\,x+\,7) = $   ?

$\,0\,\,t\,x +\,\,t$ $\,-36\,\,t\,x +\,42$ $\,36\,x \,-\,\,t$ $\,-36\,\,t\,x +\,7$ $\,-36\,\,t\,x \,-42\,\,t$ $\,-36\,x \,-42\,\,t$

$\,2\,t\;(\,-6\,t+\,2\,x) = $   ?

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

$\,6\,b\;(\,-\,b+\,9\,a) = $   ?

$\,6\,\,b^2 +\,15\,\,a\,b$ $\,5\,\,b^2 +\,15\,\,a\,b$ $\,-6\,\,b^2 \,-54\,a$ $\,-6\,\,b^2 +\,9\,a$ $\,-6\,b +\,54\,\,a\,b$ $\,-6\,\,b^2 +\,54\,\,a\,b$

$(\,2\,-4\,a)\;(\,5+\,a) = $   ?

$\,-4\,\,a^2 \,-18\,\,a +\,10$ $\,4\,\,a^2 \,-22\,\,a +\,10$ $\,-4\,\,a^2 \,-22\,\,a +\,10$ $\,-4\,\,a^2 \,-22\,\,a \,-10$

$(\,5\,-\,y)\;(\,-\,x\,-1) = $   ?

$\,-5\,\,x \,-5 +\,\,x\,y +\,\,y$ $\,-5\,\,x \,-5 \,-\,\,x\,y \,-\,\,y$ $\,5\,\,x +\,5 +\,\,x\,y +\,\,y$ $\,5\,\,x \,-5 +\,\,x\,y \,-\,\,y$

$(\,y\,-2)\;(\,6\,-5\,y) = $   ?

$\,-5\,\,y^2 +\,4\,\,y \,-12$ $\,5\,\,y^2 +\,16\,\,y \,-12$ $\,-5\,\,y^2 +\,4\,\,y +\,12$ $\,-5\,\,y^2 +\,16\,\,y \,-12$

Quelle est l'expression factorisée de $\,8\,\,b\;+\,7\,\,b^2$ ?

$\,b\;(\,8\;+\,7\,b)$ $\,b\;(\,8\;+\,7\,^{2})$ $\,b\;(\,8\;+\,7\,\,b^2)$ $\,b\;(\,8\;+\,6\,b)$

Quelle est l'expression factorisée de $\,18\;\,-16\,\,b$ ?

$\,2\;(\,9\;\,-8\,b)$ $\,2\,b\;(\,9\;\,-8\,b)$ $\,2\;(\,9\;+\,8\,b)$ $\,2\;(\,-9\;+\,8\,b)$

Quelle est l'expression factorisée de $\,-14\,\,y^2\;+\,7\,\,x\,y$ ?

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