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Sagot :

Bonjour !

I = ( 5/6 + (-1)/3 ) - ( 7/12 + 5/3 ) = ( 10/12 + (-4)/12) - ( 7/12 + 20/12 ) = (6/12) - (27/12) = -21/12 = -7/4

Voilà !

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