Réponse :
Bonsoir;
Explications étape par étape
A =( 12+1) /3x9 = 13/27
B = -8/12 +9/12 = 1/12
C = (-7x15 ) / 25x15 + ( 3 x 25)/ (25 x15) = -6/15x5 =(-2x3) /3x5x5
C= - 2/25
D = 3/6+2/6 +4/9 -5/6 = 4/9
E = 4/7 -2/7 -1/5 = 2/7 -1/5 = 10/35 - 7/35 = 3/35
