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Sagot :

2x-5(x+3)(x-2)

= 2x-5x²-2x+3x-6                j'utilise la double distributivité

=-5x²+3x-6                       

2x-5+x*x-x*2+3*x-x*2 

1+xau carre-2x+3x-2x 

x au carre -1x+1

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