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Chloeleeds
@Chloeleeds
April 2019
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Développer cette expression
-2(x+1)exposant2+3(x-1)(2x+1)-(x-2)exp2
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droopette
-2(x+1)²+3(x-1)(2x+1)-(x-2)²
=-2(x²+2x+1)+3(2x²+x-2x-1)-(x²-4x+4)
=-2x²-4x-2+6x²+3x-6x-3-x²+4x-4
=5x²-3x-9
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chloeleeds
quand je vérifie je n'obtient pas la même réponse je crois que ton calcul est faux!
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=-2(x²+2x+1)+3(2x²+x-2x-1)-(x²-4x+4)
=-2x²-4x-2+6x²+3x-6x-3-x²+4x-4
=5x²-3x-9