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Sagot :

Bonjour

Développer

(7x+2)(3x-1)

= 21x² - 7x + 6x - 2

= 21x² - x - 2

x(2-3)(5-4x)

= x (10 - 8x - 15 + 12x)

= 10x - 8x² - 15x + 12x²

= - 8x² + 12x² + 10x - 15x

= 4x² - 5x.

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