$\,-2\;(\,8\,-3\,a) = $   ?

$\,6 \,-5\,\,a$ $\,-16 +\,3\,\,a$ $\,-16 \,-6\,\,a$ $\,-16 \,-3\,a$ $\,-16 \,-5\,a$ $\,-16 +\,6\,\,a$

$\,3\,y\;(\,7\,y+\,2\,x) = $   ?

$\,21\,\,y^2 \,-6\,x$ $\,21\,\,y^2 +\,2\,x$ $\,21\,\,y^2 +\,6\,x$ $\,10\,\,y^2 +\,5\,\,x\,y$ $\,21\,\,y^2 +\,6\,\,x\,y$ $\,-21\,\,y^2 +\,5\,\,x\,y$

$\,3\,a\;(\,3\,-8\,a) = $   ?

$\,9\,\,a \,-24\,\,a^2$ $\,9 \,-24\,\,a^2$ $\,9\,\,a \,-8\,a$ $\,6\,\,a \,-5\,\,a^2$ $\,9\,\,a +\,24\,a$ $\,-9\,\,a \,-5\,a$

$(\,2+\,6\,y)\;(\,y\,-2) = $   ?

$\,6\,\,y^2 +\,14\,\,y +\,4$ $\,-6\,\,y^2 \,-14\,\,y \,-4$ $\,-6\,\,y^2 \,-10\,\,y \,-4$ $\,6\,\,y^2 \,-10\,\,y \,-4$

$(\,4\,x\,-3)\;(\,-6\,-\,y) = $   ?

$\,-24\,\,x \,-4\,\,x\,y \,-18 +\,3\,\,y$ $\,-24\,\,x \,-4\,\,x\,y +\,18 +\,3\,\,y$ $\,24\,\,x \,-4\,\,x\,y +\,18 \,-3\,\,y$ $\,24\,\,x \,-4\,\,x\,y \,-18 +\,3\,\,y$

$(\,6\,-\,b)\;(\,b\,-1) = $   ?

$\,\,b^2 +\,5\,\,b \,-6$ $\,-\,\,b^2 \,-5\,\,b \,-6$ $\,\,b^2 \,-5\,\,b \,-6$ $\,-\,\,b^2 +\,7\,\,b \,-6$

$(11y+5x)(11y-5x) = $   ?

$121\,y^2 \,- 10\,x^2$ $22\,y^2 \,- 25\,x^2$ $121\,y^2 \,- 25\,x^2$ $121\,y^2 \,- 5\,x^2$

Quelle est l'expression factorisée de $\,4\,\,a^2\;+\,5\,\,a$ ?

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

Quelle est l'expression factorisée de $\,30\,\,b\;\,-5$ ?

$\,5\;(\,6\,b\;\,-1)$ $\,5\;(\,-6\,b\;+\,1)$ $\,5\;(\,6\;\,-5\,b)$ $\,5\,b\;(\,6\,b\;\,-1)$

Factoriser l'expression :

$(\,5\,x \,-6)(\,5\,y \,-9)+(\,y +\,6)(\,5\,x \,-6)$

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