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Sagot :

Réponse :

0,75hd=45min

2,25hd=2h15min

8,25hd=8h15min

1,3hd=1h18min

3,1hd=3h6min

4) P = 2(3+x+3)=2x+12

A=x(3+x) = 3x+x² = x²+3x

Explications étape par étape

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