Bonjour, j'ai quelques soucis avec mes calcules de maths... niveau 4eme. Quelqu'un pourrais m'aider à compléter les trous ?

a. 4 X (n+3) = 4 X ... + 4 X ... = ... + ...

b. 6 (3-x) = 6 X ... - 6 X ... = ... - ...

c. 2 (5y+7) = 2 X ... + ... X 7 = ... + ...


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