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Sagot :

Bonjour,

Factoriser:

(5x-8)² - (8-5x)(x+2) = (5x-8)² +  (5x-8)(x+2)= (5x-8)​(5x-8+x+2)= (5x-8)(6x-6)

                                 = 6(5x-8)(x-1)

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