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Sagot :

Bonjour,

2)

1-(1/3+1/5) /14

1- ( 5/15 + 3/15)/14

(1-8/15)/14

(15/15 -8/15)/14

(7/15)/14

7/15 * 1/14

7/210 => 1 / 30 par mois

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