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lucie27
@lucie27
June 2021
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Quelqu'un peux m'aider s'il vous plaît merci
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Bellazelda
A=(x+3)²-8x
A=x²+2*x*3+3²-8x
A=x²+6x+9-8x
A=x²-2x+9
B=(1+x)(1-x)-(2+x)²
B=1²-x²-(2²+2*2*x+x²)
B=1-x²-(4+4x+x²)
B=1-x²+(-4)-4x-x²
B=-2x²-4x-3
C=(x-2)²+(2x+5)(1-x)
C=x²-2*x*2+2²+ 2x*1-2x*x+5*1-5*x
C=x²-4x+4+2x-2x²+5-5x
C=-x²-7x+9
1 votes
Thanks 1
lucie27
merci beaucoup
lucie27
pour la question c poir le résultat il ne faut pas rajouter le -2x?
Bellazelda
je te rassure c'est cela à la c y avait une identité remarquable + double distributivite
lucie27
donc on le rajoute ou pas?
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Lista de comentários
A=x²+2*x*3+3²-8x
A=x²+6x+9-8x
A=x²-2x+9
B=(1+x)(1-x)-(2+x)²
B=1²-x²-(2²+2*2*x+x²)
B=1-x²-(4+4x+x²)
B=1-x²+(-4)-4x-x²
B=-2x²-4x-3
C=(x-2)²+(2x+5)(1-x)
C=x²-2*x*2+2²+ 2x*1-2x*x+5*1-5*x
C=x²-4x+4+2x-2x²+5-5x
C=-x²-7x+9