Bonsoir
a= -17/9 - -5/9 = -17/9 + 5/9 = -12/9 = -4/3
b=-17/7×-49/27×2 =( -17 x -49 x 2)/7 x 27 = (-17 x 7 x 2)/ 1 x 27 = -378/27 = -14
c=-1/5+3/10-7/6 = - 6/30 + 9/30 - 35/30 = -41/30 + 9/30 = - 32/30 = - 16/15
D= (3/4+3):(1/3+2) = (3/4 + 12/4) : (1/3 + 6/3) = 15/4 : 7/3 = 15/4 x 3/7 = 45/28
