$\,-6\;(\,7\,x\,-8) = $   ?

$\,-42\,\,x +\,48$ $\,-42\,\,x \,-8$ $\,\,x \,-14$ $\,-42\,\,x \,-48$ $\,42\,\,x \,-14$ $\,-42\,\,x +\,8$

$\,2\,x\;(\,7\,x+\,y) = $   ?

$\,14\,\,x^2 +\,2\,\,x\,y$ $\,14\,x +\,2\,\,x\,y$ $\,9\,\,x^2 +\,3\,\,x\,y$ $\,14\,\,x^2 +\,y$ $\,-14\,\,x^2 +\,3\,\,x\,y$ $\,14\,\,x^2 \,-2\,y$

$\,2\,t\;(\,-4\,t\,-1) = $   ?

$\,-8\,\,t^2 \,-2\,\,t$ $\,-8\,\,t^2 \,-1$ $\,-8\,\,t^2 +\,1$ $\,8\,\,t^2 \,-2$ $\,-8\,\,t^2 +\,2$ $\,-2\,\,t^2 +\,\,t$

$(\,3+\,b)\;(\,6\,-\,b) = $   ?

$\,\,b^2 +\,9\,\,b +\,18$ $\,-\,\,b^2 +\,3\,\,b +\,18$ $\,-\,\,b^2 +\,9\,\,b \,-18$ $\,-\,\,b^2 \,-9\,\,b +\,18$

$(\,a\,-6)\;(\,-\,b\,-3) = $   ?

$\,\,a\,b \,-3\,\,a +\,6\,\,b +\,18$ $\,-\,\,a\,b +\,3\,\,a +\,6\,\,b \,-18$ $\,-\,\,a\,b \,-3\,\,a \,-6\,\,b \,-18$ $\,-\,\,a\,b \,-3\,\,a +\,6\,\,b +\,18$

$(\,2\,a\,-3)\;(\,-4\,a+\,6) = $   ?

$\,-8\,\,a^2 +\,24\,\,a +\,18$ $\,-8\,\,a^2 +\,24\,\,a \,-18$ $\,-8\,\,a^2 \,-24\,\,a \,-18$ $\,-8\,\,a^2 +\,18$

$(-12x+5)(-12x-5) = $   ?

$144\,x^2 \,+ 25$ $144\,x^2 \,- 10$ $144\,x^2 \,- 25$ $144\,x^2 \,- 5$

Quelle est l'expression factorisée de $\,3\,\,t\;+\,8\,\,t^2$ ?

$\,t\;(\,3\,t\;+\,8)$ $\,t\;(\,3\;+\,7\,t)$ $\,t\;(\,3\;+\,8\,t)$ $\,t\;(\,3\;+\,8\,\,t^2)$

Quelle est l'expression factorisée de $\,21\;\,-18\,\,a$ ?

$\,3\;(\,7\;\,-18\,a)$ $\,3\;(\,-7\;+\,6\,a)$ $\,3\;(\,7\,a\;\,-18)$ $\,3\;(\,7\;\,-6\,a)$

Factoriser l'expression :

$(\,8\,x \,-4)(\,6\,y +\,3)+(\,2\,y +\,3)(\,8\,x \,-4)$

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