Calculs avec relatifs et fractions. Donner le résultat sous la forme la plus simple A=1-(1/3-5/4)-(-5/6+1/2) B=7/20-2/15-9/30 C=-(-1/2)-(+3/4)+(-1/10) D=1/4-(9/

bonjour

a = 1 - ( 4/12 - 15/12) - ( - 5/6 + 3/6)
a = 1 - ( - 11 /12) - ( - 2/6)
a = 12/12 + 11/12 + 4/12
a = 27/12 = 9/4

b =  7/20 - 2/15 - 9/30
b = 21/60 - 8/60 - 18/60
b = - 5/60 = - 1/12

c = - (- 1/2) - 3/4 - 1/10
c = 1/2 - 3/4 - 1/10
c =  10/20 - 15/20 - 2/20
c = - 7/20

d = 1/4 - ( 9/10 - 5/3 x 6/25)
d = 1/4 - ( 9/10 - 30/75)
d = 1/4 - ( 9/10 - 2/5)
d = 1/4 - ( 9/10 - 4/10)
d = 1/4 - 5/10
d = 5/20 - 10/20
d = - 5 /20 = - 1/4

E = - (-1/2-(-1/4-1/8))
E = - ( - 1/2 - (2/8 - 1/8))
E = - ( - 1/2 - 1/8)
E = 4/8 + 1/8
E = 5/8

F= -11/18+13/12-1
F = - 22/36 + 39/36 - 36/36
F = - 19/36