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Sagot :

Bonjour,

(-2x+1)(3x+10)-(-4x-7)(5x-1)

= -6x²-20x+3x+10-(-20x²+4x-35x+7)

= -6x²-20x+3x+10+20x²-4x+35x-7

= -6x²+20x²-20x+3x-4x+35x+10-7

= 14x²+14x+3

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