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Sagot :

Réponse :

Bonsoir

Explications étape par étape

A = 2x^2 + 4x^2

A = 6x^2

B = 6x^2 - 10x^2

B = -4x^2

C = 10x^2 + 2x + 3x^2 + 3x

C = 13x^2 + 5x

D = 9x^2 - 2x -1 + x^2 + x^2 - x + 3

D = 11x^2 - 3x + 2

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