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Sagot :

G=7x*3x-7x*5y
G=21x²-35xy

il  a y un probleme a la H

I=3x*3-3x*5y-2*3-3*5y
I=9x-15xy-6-15y
G= 21x²-35xy

I= 9x-15xy-6+10y

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