Réponse :
A= 22/12
B= 1/5
C= 15/6
D= 11/32
E= 7/9
F= 44/5
G= 54/48
H= 24/5
Explications étape par étape :
A= 2/12+5/3; 2/12+5x4/3x4; 2/12+20/12= 22/12
B= 6/5-1; 6/5-5/5= 1/5
C= 9/6+ 1; 9/6+6/6=15/6
D= 5/32-2/4; 5/32-2x8/4x8; 5/32-16/32=11/32
E= 1/9+6/9=7/9
F= 4/5+8; 4/5+40/5= 44/5
G= 6/48+8/8; 6/48+8x6/8x6; 6/48+48/48=54
H= 5-1/5; 25/5-1/5=24/5