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Sagot :

Bonsoir,

1) 7(3+a)+a² = a²+7a+21

3) a) 2 × (p + 1,5 + 3) = 2p + 9

   b) y + 2×2 + 1/2 × 2 × π × y/2 = y + 4 + yπ/2

   c) 6d + 2x + 2c

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