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Estellebrl83
@Estellebrl83
May 2019
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Merci de m’aider pour l’exercice 4
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calinizou
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Bonsoir
1/ développer
A=(2x+3)(8-x)-4(8-x)=
16x -2x²+24-3x-32+4x=
-2x²+17x-8
2/ A=(8-x)(2x-1)=
16x-8 -2x²+x=
-2x²+17x-8
3/ A=0
8-x=0
-x=-8
x=8
2x-1=0
2x=1
x=1/2
donc solution est 8 et 1/2
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Bonsoir1/ développer
A=(2x+3)(8-x)-4(8-x)=
16x -2x²+24-3x-32+4x=
-2x²+17x-8
2/ A=(8-x)(2x-1)=
16x-8 -2x²+x=
-2x²+17x-8
3/ A=0
8-x=0
-x=-8
x=8
2x-1=0
2x=1
x=1/2
donc solution est 8 et 1/2