1= calculer les expression suivantes en detaillant les etapes et en donnant le resultat sous la forme dune fraction simplifie le plus possible pouriez vous maid

A = 3/4 +1/4 X 2/3 +1/3
3/4 + 2/12 +1/3
9/12 + 2/12 + 4/12
15/12
B = 3/4 + 1/2 X ( 2/3 -1)
3/4 +1/2 (2/3 -3/3)
3/4 +1/2 X -1/3
3/4 -1/6
18/24 -4/24 = 14/24 = 7/12

C = (1/4 -1/5) X (7 +37/9)
(5/20 -4/20) X ( 63/9 + 37/9)
1/20 X 100/9
100/180 = 10/18 = 5/9

1= 3/4+1/4*2/3+1/3 
1=0.75+0.5*2sur3+1sur3
1=0.75+1sur3+1sur3
1=0.75+2sur3
1=17sur12
2=3/4+1/2*(2/3-1)
2=3/4+1/2*-1sur3
2=0.75+0.5*.1sur3
2=1.25*.1sur3
2=-5sur12
3=(1/4-1/5)*(7+37/9)
3=(0.25-0.2)*(7+37sur9)
3=0.25*7+0.25*37sur9-0.2*7-0.2*37sur9
3=1.75+37sur36-1.4-37sur45
3=25sur9-26sur45
3=11sur5