Bonjour enfaîte jai besoin d'aide sur mon devoir de Mathématiques .

Exercice 1:

B=19/4 - [1/2-(3/8-1/4)] ;
F=24/15-[- -2/3-(11/-5-2)]

Exercice 2:

calculé les expressions suivantes pour a=3 ; b=5et c =-7 et donne le résultat sous la forme d'une fraction irréductible :

A=1/a+2/a-3/c ; B= b/a+a/b ;
C =a-c/a+b

Bonne journée

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