$\,-5\;(\,-4\,b\,-4) = $   ?

$\,20\,\,b +\,4$ $\,20\,\,b +\,20$ $\,20\,\,b \,-20$ $\,20\,\,b \,-4$ $\,20\,\,b \,-9$ $\,-9\,\,b \,-9$

$\,4\,t\;(\,2\,t+\,x) = $   ?

$\,8\,\,t^2 +\,4\,x$ $\,6\,\,t^2 +\,5\,\,t\,x$ $\,8\,\,t^2 +\,4\,\,t\,x$ $\,8\,\,t^2 \,-4\,x$ $\,-8\,\,t^2 +\,5\,\,t\,x$ $\,8\,\,t^2 +\,x$

$\,2\,b\;(\,-8+\,7\,b) = $   ?

$\,-16\,\,b +\,7\,b$ $\,-16\,\,b +\,9\,\,b^2$ $\,-6\,\,b +\,9\,\,b^2$ $\,-16\,\,b \,-14\,b$ $\,16\,\,b +\,14\,b$ $\,-16\,\,b +\,14\,\,b^2$

$(\,1+\,b)\;(\,5\,b\,-6) = $   ?

$\,5\,\,b^2 \,-\,\,b \,-6$ $\,5\,\,b^2 \,-11\,\,b +\,6$ $\,-5\,\,b^2 \,-\,\,b +\,6$ $\,-5\,\,b^2 \,-11\,\,b \,-6$

$(\,3\,-3\,y)\;(\,-\,x\,-2) = $   ?

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

$(\,b\,-6)\;(\,-2+\,b) = $   ?

$\,-\,\,b^2 \,-4\,\,b +\,12$ $\,\,b^2 +\,4\,\,b \,-12$ $\,\,b^2 \,-8\,\,b \,-12$ $\,\,b^2 \,-8\,\,b +\,12$

$(10y+9x)(10y-9x) = $   ?

$100\,y^2 \,- 9\,x^2$ $100\,y^2 \,- 18\,x^2$ $100\,y^2 \,- 81\,x^2$ $100\,y^2 \,- 81x$

Quelle est l'expression factorisée de $\,4\,\,a^2\;+\,7\,\,a$ ?

$\,a\;(\,4\,a\;+\,7)$ $\,a\;(\,4\;+\,7\,a)$ $\,a\;(\,4\,a\;+\,6)$ $\,a\;(\,4\,a\;+\,7\,\,a)$

Quelle est l'expression factorisée de $\,8\,\,t\;\,-4$ ?

$\,4\;(\,2\,t\;+\,1)$ $\,4\;(\,2\,t\;\,-1)$ $\,4\;(\,2\,t\;\,-4)$ $\,4\;(\,2\;\,-4\,t)$

Factoriser l'expression :

$(\,x +\,8)(\,4\,y \,-1)+(\,9\,y +\,7)(\,x +\,8)$

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