April 2019 2 62 Report

aidez moi car svp je ne comprend pas mon exercice merci d'avance .

1:trouver la forme simplifiée de (9X)au carré

2:calculer:

7X(2a+b)-7X(5+a)+7X(-3)

3:calculer:

(3-X)(12X-8)+(3-X)(8+Xy)

merci de votre aide

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