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Sagot :

MAUDMARINE

Bonjour

A = (a + 5) (a + 7)

A = a² + 7a + 5a + 35

A = a² + 12a + 35

B = (y - 6) (y - 9)

B = y² - 9y - 6y + 54

B = y² - 15y + 54

C = (4x + 3) (3x - 1)

C = 12x² - 4x + 9x - 3

C = 12x² + 5x - 3

D = (1 - 2t) (1 - 2t)

D = 1 - 2t - 2t + 4t²

D = 4t² - 4t + 1.

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