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Sagot :

Bonjour,

A=13/5-2/7+9/5+6/7-7/5-4/7
A=13/5+9/5-7/5-2/7+6/7-4/7
A=13+9-7/5-2+6-4/7
A=15/5-0/7
A=3

Bonne journée.

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