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Sagot :

(2y-4)(3y+3)=6y²+6y-12y-12=6y²-6y-12

(-y+3)(8-y) = -8y+y²+24-3y=y²-11y+24

et

-(y+6)(2y+4) = -(2y²+4y+12y+24)= -2y²-16y-24

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