Réponse :
A = 4/9 + 1/27 = (4X3)/(9X3) + 1/27 = 12/27 + 1/27 = 13/27
B = -2/3 + 3/4 = (-2X4)/(3X4) + (3X3)/(4X3) = -8/12 + 9/12 = 1/12
A = 2/3 X 5/11 = (2X5)/(3X11) = 10/33
B = 7 X 2/3 = (7X2)/3 = 14/3
C = 2/-3 X -7/-5 = (2X-7)/(-3X-5) = -14/15
Explications étape par étape
