Bonjour, pouvez-vous m’aider svp Merci

bonjour

A = -9/15 + 14/15 = (-9+14) / 15 = 5/15 = 5*1/5x3 = 1/3

B = 7/4 + 1/16 - 2 = (7x4)/16 + 1/16 - 2 = (28+1)/16 - 32/16 = (29-32) / 16 = -3/16

C = -5/4 - (7/3-9/2) = -5/4 - ((7x2)/6 - (9x3)/6)

= -5/4 - ((14-27)/6) = -5/4 + 13/6 = -15/12 + 26/12 = 11/12

:)