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bonjour, j’aurais besoin de votre aide svp !!

Factoriser
A=x²+8x+16
B=9x² +6x +1
C=x²-6x+9
D=4x²-12x+9
E=16a²-1
F=4x²-1
G=x²-81
H=9x²-30x +25

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