$\,-5\;(\,-7\,a\,-1) = $   ?

$\,-35\,\,a \,-6$ $\,35\,\,a \,-5$ $\,35\,\,a +\,1$ $\,35\,\,a \,-1$ $\,35\,\,a +\,5$ $\,-12\,\,a \,-6$

$\,-4\,t\;(\,9\,x+\,8) = $   ?

$\,36\,x \,-4\,\,t$ $\,5\,\,t\,x +\,4\,\,t$ $\,-36\,\,t\,x \,-32$ $\,-36\,\,t\,x \,-32\,\,t$ $\,-36\,\,t\,x +\,32$ $\,-36\,\,t\,x +\,8$

$\,3\,x\;(\,-4\,x+\,y) = $   ?

$\,-12\,\,x^2 \,-3\,y$ $\,12\,x +\,3\,\,x\,y$ $\,-12\,\,x^2 +\,3\,\,x\,y$ $\,-12\,\,x^2 +\,y$ $\,-12\,\,x^2 +\,4\,\,x\,y$ $\,-\,\,x^2 +\,4\,\,x\,y$

$\,5\,b\;(\,3\,b+\,3\,a) = $   ?

$\,15\,\,b^2 \,-15\,a$ $\,15\,\,b^2 +\,3\,a$ $\,15\,\,b^2 +\,15\,\,a\,b$ $\,-15\,\,b^2 +\,8\,\,a\,b$ $\,15\,\,b^2 +\,15\,a$ $\,8\,\,b^2 +\,8\,\,a\,b$

$(\,3\,y+\,4)\;(\,-\,y+\,2) = $   ?

$\,-3\,\,y^2 +\,2\,\,y +\,8$ $\,-3\,\,y^2 +\,10\,\,y \,-8$ $\,-3\,\,y^2 \,-10\,\,y +\,8$ $\,3\,\,y^2 +\,2\,\,y \,-8$

$(\,4\,y\,-6)\;(\,-2\,-3\,x) = $   ?

$\,8\,\,y \,-12\,\,x\,y +\,12 \,-18\,\,x$ $\,8\,\,y \,-12\,\,x\,y +\,12 +\,18\,\,x$ $\,-8\,\,y \,-12\,\,x\,y +\,12 +\,18\,\,x$ $\,8\,\,y \,-12\,\,x\,y \,-12 +\,18\,\,x$

$(\,6+\,y)\;(\,-5\,-4\,y) = $   ?

$\,-4\,\,y^2 \,-29\,\,y \,-30$ $\,-4\,\,y^2 +\,29\,\,y \,-30$ $\,4\,\,y^2 \,-29\,\,y \,-30$ $\,4\,\,y^2 \,-19\,\,y \,-30$

Quelle est l'expression factorisée de $\,5\,\,y\;+\,7\,\,y^2$ ?

$\,y\;(\,5\;+\,7\,y)$ $\,y\;(\,5\,y\;+\,7)$ $\,y\;(\,5\;+\,7\,\,y^2)$ $\,y\;(\,5\;+\,7\,^{2})$

Quelle est l'expression factorisée de $\,35\;\,-10\,\,x$ ?

$\,5\;(\,7\;+\,x)$ $\,5\;(\,7\;\,-2\,x)$ $\,5\;(\,-7\;+\,2\,x)$ $\,5\,x\;(\,7\;\,-2\,x)$

Quelle est l'expression factorisée de $\,-12\,\,y^2\;+\,14\,\,x\,y$ ?

$\,2\,y\;(\,-6\,y\;+\,7\,x)$ $\,2\,y\;(\,-6\,x\;+\,14\,y)$ $\,2\,y\;(\,6\,y\;+\,7\,x)$ $\,2\,y\;(\,6\,y\;\,-7\,x)$