Bonjour
je suis toujours embêtée pour développer cette expression:
B=(6y-11)-(3y+2)(7y-9)
voilà ce que j'ai trouvé:
B=(6y-11)-(3y+2)(7y-9)
B=(6y-11)-(3y+2)(7y+(-9))
B=(6y-11)-3y X 7y+ 3y X (-9) + 2 X 7y+2 X (-9)
B=21y au carré + 6y + (-27y) + 14y -11 + (-18)
B=21y au carré + (-7y) - 29
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