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Sagot :

Réponse:

A= 5x-4+7x-8x+6

= 5x+7x-8x-4+6

= 12x -8x +2

= 4x+2

B= -4y +5 - 2y² +y -8y² -3y -11

= -4y+y-3y -2y²-8y² +5-11

= -6y -10y²-6

C= 5 -25x² +3y -5x -7y +4x²

= 5-25x²+4x²+3y-7y-5x

= 5-21x²-4y-5x

j'espère que ça va t'aider

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