$\,-6\;(\,5\,a\,-6) = $   ?

$\,-30\,\,a \,-6$ $\,-\,\,a \,-12$ $\,30\,\,a \,-12$ $\,-30\,\,a +\,6$ $\,-30\,\,a +\,36$ $\,-30\,\,a \,-36$

$\,4\,a\;(\,8\,a+\,3\,b) = $   ?

$\,32\,\,a^2 +\,3\,b$ $\,-32\,\,a^2 +\,12\,b$ $\,32\,\,a^2 +\,12\,\,a\,b$ $\,12\,\,a^2 +\,7\,\,a\,b$ $\,32\,\,a^2 +\,7\,\,a\,b$ $\,32\,\,a^2 \,-12\,b$

$\,4\,y\;(\,8+\,y) = $   ?

$\,-32\,\,y +\,4\,y$ $\,32\,\,y +\,5\,\,y^2$ $\,32\,\,y \,-4\,y$ $\,12\,\,y +\,5\,\,y^2$ $\,32\,\,y +\,y$ $\,32\,\,y +\,4\,\,y^2$

$(\,5+\,6\,y)\;(\,-4\,y+\,5) = $   ?

$\,-24\,\,y^2 +\,10\,\,y \,-25$ $\,-24\,\,y^2 +\,50\,\,y +\,25$ $\,-24\,\,y^2 +\,10\,\,y +\,25$ $\,24\,\,y^2 +\,10\,\,y \,-25$

$(\,3\,-\,x)\;(\,-\,y\,-5) = $   ?

$\,-3\,\,y \,-15 +\,\,x\,y \,-5\,\,x$ $\,3\,\,y \,-15 +\,\,x\,y +\,5\,\,x$ $\,-3\,\,y \,-15 +\,\,x\,y +\,5\,\,x$ $\,-3\,\,y +\,15 +\,\,x\,y +\,5\,\,x$

$(\,5+\,3\,t)\;(\,-4\,t\,-5) = $   ?

$\,-12\,\,t^2 \,-5\,\,t \,-25$ $\,-12\,\,t^2 \,-35\,\,t +\,25$ $\,12\,\,t^2 \,-35\,\,t \,-25$ $\,-12\,\,t^2 \,-35\,\,t \,-25$

$(-11+y)(-11-y) = $   ?

$121 \,- \,y^2$ $121 \,- y$ $-11 \,- \,y^2$ $-22 \,- \,y^2$

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

$\,b\;(\,2\;+\,4\,b)$ $\,b\;(\,2\;+\,5\,b)$ $\,b\;(\,2\;+\,b)$ $\,b\;(\,2\;+\,5\,^{2})$

Quelle est l'expression factorisée de $\,5\,\,t\;\,-20$ ?

$\,5\;(\,t\;\,-4)$ $\,5\;(\,t\;\,-20)$ $\,5\;(\,t\;+\,4)$ $\,5\;(\,1\;\,-20\,t)$

Factoriser l'expression :

$(\,x +\,4)(\,-6\,y +\,5)+(\,7\,y +\,7)(\,x +\,4)$

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