1 )Recopier et completer les égalités suivantes:A= 2/3 + 4/5 = 2x.... + 4 x ...  = ... /15 + ... /15 = .../15                          3x ....    5 x ...  B= 1/6 - 5/7 = 1x....  -  5x ...  = ... /42 -... /42 = ... /42                         6x ....    7 x ... 
C= -3/2 + 7/9 = - 3x....  +  7x ...  = ... /18 +  ... /18 = ... /18                             2x ....    9 x ... 

2 )Calculer les expresions suivantes : A= 3/7+ 5/2 =B= -5/3+7/8 =C= -8/5 - 5/3 =D= 1/9- -7/4
3 ) Calculer les expresions ci dessous :A= -13/6 + -9/4=B= -7/15 + 11/6 =C= 7/8 + -11/6=
MERCI DE DETAILLER LES CALCULS POUR LE 2) Et 3)
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