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Sagot :

bjr

 

(x - 2)(7x + 6) =                      (* = multiplié)

x*7x + x*6 -2*7x - 2*6 =

7x² + 6x - 14x - 12 =                     (on réduit 6x - 14x = (6 - 14)x = -8x]

7x² - 8x - 12

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