Bonsoir,

Calculer:

(4/3)-1/ (7/6)-2= ( (4-1*3)/3 ) / ((7-2x6)/6 )= (1/3)/ (-5/6)= (1/3)(-6/5)=-6/15= -2/5

(2/3+1/2) / (17/9 -1/3)= ((2x2+1x3)/6)/ (17x3-1x9)/ (9x3)= (7/6 )/(14/9)= (7/6 )(9/14)

                                = (7x9)/(6x14)= ... calcule puis simplifie