$\,-3\;(\,3\,b\,-9) = $   ?

$\,-9\,\,b \,-12$ $\,-9\,\,b +\,9$ $\,-9\,\,b +\,27$ $\,-9\,\,b \,-9$ $\,-9\,\,b \,-27$ $\,0\,\,b \,-12$

$\,5\,a\;(\,-4\,a+\,5\,b) = $   ?

$\,-20\,\,a^2 +\,25\,b$ $\,-20\,\,a^2 \,-25\,b$ $\,20\,\,a^2 +\,10\,\,a\,b$ $\,\,a^2 +\,10\,\,a\,b$ $\,-20\,\,a^2 +\,25\,\,a\,b$ $\,-20\,\,a^2 +\,5\,b$

$\,5\,b\;(\,9\,b\,-4) = $   ?

$\,-45\,\,b^2 +\,1$ $\,14\,\,b^2 +\,\,b$ $\,45\,\,b^2 \,-20\,\,b$ $\,45\,\,b^2 \,-4$ $\,45\,\,b^2 \,-20$ $\,45\,\,b^2 +\,20$

$(\,t+\,5)\;(\,2\,-3\,t) = $   ?

$\,-3\,\,t^2 +\,17\,\,t +\,10$ $\,3\,\,t^2 \,-17\,\,t +\,10$ $\,-3\,\,t^2 \,-13\,\,t +\,10$ $\,-3\,\,t^2 +\,13\,\,t +\,10$

$(\,3\,-\,x)\;(\,-6\,y\,-3) = $   ?

$\,-18\,\,y \,-9 +\,6\,\,x\,y +\,3\,\,x$ $\,-18\,\,y \,-9 \,-6\,\,x\,y \,-3\,\,x$ $\,-18\,\,y +\,9 +\,6\,\,x\,y +\,3\,\,x$ $\,18\,\,y +\,9 +\,6\,\,x\,y +\,3\,\,x$

$(\,5\,-2\,t)\;(\,-6\,t+\,3) = $   ?

$\,12\,\,t^2 +\,24\,\,t +\,15$ $\,12\,\,t^2 \,-24\,\,t \,-15$ $\,-12\,\,t^2 \,-24\,\,t +\,15$ $\,12\,\,t^2 \,-36\,\,t +\,15$

$(10y+4x)(10y-4x) = $   ?

$100\,y^2\, -80\,x\,y\,+ 16\,x^2$ $100\,y^2 \,- 4\,x^2$ $100\,y^2 \,+ 16\,x^2$ $100\,y^2 \,- 16\,x^2$

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

$\,y\;(\,8\,y\;+\,\,y)$ $\,y\;(\,8\,y\;+\,1)$ $\,y\;(\,8\;+\,y)$ $\,y\;(\,8\,^{2}\;+\,1)$

Quelle est l'expression factorisée de $\,27\,\,x\;\,-12$ ?

$\,3\;(\,9\,x\;\,-4)$ $\,3\;(\,9\,x\;+\,4)$ $\,3\;(\,9\,x\;\,-12)$ $\,3\,x\;(\,9\,x\;\,-4)$

Factoriser l'expression :

$(\,5\,x \,-8)(\,-3\,y +\,1)+(\,8\,y +\,6)(\,5\,x \,-8)$

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