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Sagot :

Bonjour

Réduire les expressions suivantes :

2x + 3x - 7x = 5x - 7x = - 2x

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

7x - 2x² + 2x - 3 + 6x² = - 2x² + 6x² + 7x + 2x - 3 = 5x² + 9x - 3

5x² + 12 - 3x - 7x² + x - 20 = 5x² - 7x² - 3x + x + 12 - 20 = - 2x² - 2x - 8.

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