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Sagot :

Résoudre l'équation f(x)=(3-x)²
f(x)= (3x+3)(3-x)(3x+3)(3-x)=(3-x)²
f(x) = (3x+3) ² (3-x)² = (3-x)²
f(x) = (3x+3)²=0
3x+3 =0
3(x+1)=0
x= -1

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