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Sagot :

 A = (2x + 1)(-x + 10)

A=-2x+20x-1x+10

A=17x+10

 

voilà.. :)

A=(2x +1)(-x+10)

 

 Ou 2x + 1=à        Ou -x+10= 0

        2x= -1                  -x=-10

        x= -1/2                  x=10

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