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Sagot :

Réponse:

2x + 3x - 7x

= 5x - 7x

= -2x

3x + 5 - 8x + 2y - 3

= -5x + 2y + 2

7x - 2x² + 2x - 3 + 6x²

= 4x² + 9x - 3

5x² + 12 - 3x - 7x² + x - 20

= -2x²- 2x - 8

ALBANITO73

Réponse :

2 + 3 - 7

-2

3 + 5 - 8 + 2y - 3

-5 + 2y + 2

7 - 2² + 2 - 3 + 6²

4² + 9 - 3

5² + 12 - 3 - 7² + -20

-2² -2 -8

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