Pouvez-vous m’aider svp ses un devoir maison noté merci

exercice 3 :
A = 3x5/2x5 + 7x2/5x2 = 15/10 + 14/10 = 29/10
B= 7 x4/3x4 - 5x3/4x3 = 28/12 - 15/12 =13/12
C =- 5x11/6x11 +3x6/11x6 = -55/66+18/66 = -37/66
D =-4x3/5x3-7x5/3x5=-12/15-35/15 = -47/15
Bon courage