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Srk
@Srk
April 2019
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Résoudre les équations suivantes : a. 7 x ² – x = 0
b. 9 x ² = 3 x
Merci d'avance
SRK
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nonotata
X²+7x=0
mettre x en facteur
x(x+7)=0
donc
x=0 ou x+7=0
x=0 ou x=-7
b. 9 x ² = 3 x
9x²-3x = 0
9x² = 0 ou -3x = 0
x² = 9 ou x = -1/3
x = 3 ou x = -1/3
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mettre x en facteur
x(x+7)=0
donc
x=0 ou x+7=0
x=0 ou x=-7
b. 9 x ² = 3 x
9x²-3x = 0
9x² = 0 ou -3x = 0
x² = 9 ou x = -1/3
x = 3 ou x = -1/3