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Sagot :

Bonjour

A = 3 (x - 2) + 5 (3 - x)

A = 3x - 6 + 15 - 5x

A = - 2x + 9

B = x (3 + x) - 2 (x + 5)

B = 3x + x² - 2x - 10

B = x² + x - 10

C = - 2 (x - 7) - 2 (x² + x) + 4 (x² + 1)

C = - 2x + 14 - 2x² - 2x + 4x² + 4

C = 2x² - 4x + 18

2)

A = 2 (x - 1) + 2 (y + 2) - 2 (1 + z)

A = 2x - 2 + 2y + 4 - 2 - 2z

A = 2x + 2y - 2z

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

B = 3x - 3 + 3y + 3z + 3

B = 3x + 3y + 3z.

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