Bonjour
a=7/6+5/4x8/3
a = 7/6 + 40/12
a = (7 x 2) / (6 x 2) + 40/12
a = 14/12 + 40/12
a = 54/12
a = (6 x 9) / ( 6 x 2)
a = 9/2
b=25/6:(3/4x5/7)
b = 25/6 : 15/28
b = 25/6 x 28/18
b = 700/108
b = (4 x 175) / (4 x 27)
b = 175/27
c=25/6-37/6
c = - 12/6
c = (2 x - 2) / (2 x 1)
c = - 2
d=25/3+17/7
d = (25 x 7) / (3 x 7) + (17 x 3) / (7 x3)
d = 175/21 + 51/21
d = 226/21
e=8:24/25
e = 8 x 25/24
e = 200/24
e = (8 x 25) / (8 x 3)
e = 25/3.