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Sagot :

Réponse :

bonsoir

• Developper :

D = (3 - 8x) - (4x - 7)

D = 3 - 8x - 4x - (-7)

D = 3 - 8x - 4x + 7

D = - 12x + 10

E = 7(3 - 2x) - 4x(2x - 1)

E = 7 * 3 + 7 * (-2x) - 4x * 2x - 4x * (-1)

E = 21 - 14x - 8x^2 + 4x

E = -8x^2 - 10x + 21

F = 7x - 5(2 - 9x) + 7(9x - 1)

F = 7x - 5 * 2 - 5 * (-9x) + 7 * 9x + 7 * (-1)

F = 7x - 10 + 45x + 63x - 7

F = 115x - 17

Réponse :

D = (3-8x)-5(4x-7)

= 3-8x-20x+35

= 38-28x

E = 7(3-2x)-4x(2x-1)

= 21-14x-8x²+4x

=-8x²-10x+21

F = 7x-5(2-9x)+7(9x-1)

= 7x-10+45x +63x-7

=115x -17

Explications étape par étape

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