$\,-2\;(\,-7\,-2\,a) = $   ?

$\,14 \,-2\,a$ $\,14 \,-4\,a$ $\,-9 \,-4\,\,a$ $\,14 \,-4\,\,a$ $\,14 +\,2\,\,a$ $\,14 +\,4\,\,a$

$\,-6\,y\;(\,6+\,8\,x) = $   ?

$\,0\,\,y +\,2\,\,x\,y$ $\,-36\,\,y +\,8\,x$ $\,-36 \,-2\,\,x\,y$ $\,36 \,-48\,\,x\,y$ $\,-36\,\,y +\,48\,x$ $\,-36\,\,y \,-48\,\,x\,y$

$\,3\,x\;(\,4\,x+\,2\,y) = $   ?

$\,7\,\,x^2 +\,5\,\,x\,y$ $\,12\,\,x^2 +\,6\,\,x\,y$ $\,12\,\,x^2 +\,2\,y$ $\,-12\,\,x^2 +\,5\,\,x\,y$ $\,12\,\,x^2 +\,6\,y$ $\,12\,\,x^2 \,-6\,y$

$\,3\,a\;(\,2\,a\,-9\,b) = $   ?

$\,-6\,\,a^2 \,-6\,b$ $\,6\,\,a^2 \,-27\,\,a\,b$ $\,6\,\,a^2 \,-9\,b$ $\,6\,\,a^2 \,-27\,b$ $\,5\,\,a^2 \,-6\,\,a\,b$ $\,6\,\,a^2 +\,27\,b$

$(\,4+\,4\,y)\;(\,-\,y+\,5) = $   ?

$\,-4\,\,y^2 \,-16\,\,y +\,20$ $\,-4\,\,y^2 +\,16\,\,y +\,20$ $\,4\,\,y^2 +\,16\,\,y +\,20$ $\,-4\,\,y^2 +\,16\,\,y \,-20$

$(\,a\,-5)\;(\,-4\,-6\,b) = $   ?

$\,-4\,\,a \,-6\,\,a\,b +\,20 +\,30\,\,b$ $\,-4\,\,a +\,6\,\,a\,b +\,20 \,-30\,\,b$ $\,-4\,\,a \,-6\,\,a\,b +\,20 \,-30\,\,b$ $\,4\,\,a \,-6\,\,a\,b +\,20 \,-30\,\,b$

$(\,5\,y\,-1)\;(\,2\,-5\,y) = $   ?

$\,-25\,\,y^2 +\,15\,\,y \,-2$ $\,25\,\,y^2 +\,15\,\,y +\,2$ $\,-25\,\,y^2 \,-5\,\,y \,-2$ $\,-25\,\,y^2 \,-15\,\,y \,-2$

Quelle est l'expression factorisée de $\,5\,\,b^2\;+\,3\,\,b$ ?

$\,b\;(\,5\,^{2}\;+\,3)$ $\,b\;(\,5\;+\,3\,b)$ $\,b\;(\,5\,b\;+\,2)$ $\,b\;(\,5\,b\;+\,3)$

Quelle est l'expression factorisée de $\,56\,\,a\;\,-35$ ?

$\,7\;(\,8\;\,-35\,a)$ $\,7\;(\,8\,a\;\,-35)$ $\,7\;(\,8\,a\;\,-5)$ $\,7\,a\;(\,8\,a\;\,-5)$

Quelle est l'expression factorisée de $\,-63\,\,x^2\;+\,56\,\,x\,y$ ?

$\,7\,x\;(\,-9\,y\;+\,56\,x)$ $\,7\,x\;(\,-9\,x\;+\,8\,\,x\,y)$ $\,7\,x\;(\,-9\,x\;+\,8\,y)$ $\,7\,\,x^2\;(\,-9\;+\,8\,y)$