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Sagot :

DEVYSFIONA

Bonjour,

On va développer chacune de ces expressions :

A= 4x + 2(x-1)

A= 4x +2x -2

A = 6x -2

B= 3x + 3(x-1) +1

B= 3x + 3x -3 +1

B = 6x -2

C= 4x + 4(x-1) -2(x-1)

C= 4x + 4x -4 -2x +2

C = 6x -2

On remarque que A=B=C.

En espérant que ça t'aide, n'hésites pas si tu as des questions, bonne journée !

Fiona (:

Bonjour,

4x + 2(x - 1) = 4x + 2 * x + 2 * -1 = 4x + 2x - 2 = 6x - 2

3x + 3(x - 1) + 1 = 3x + 3 * x + 3 * -1 + 1 = 3x + 3x - 3 + 1 = 6x - 2

4x + 4 * x + 4 * -1 - 2 * x - 2 * -1 = 4x + 4x - 4 - 2x + 2 = 6x - 2

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