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Sagot :

Bonjour,

Développer :

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

A = 4x² - 25

B=(3-4x)(3+4x)

B = 9 - 16x²

C=(2x-3)(3x+2)

C = 6x² + 4x - 9x - 6

C = 6x² - 5x - 6.

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