Réponses

2013-12-11T11:41:57+01:00
A = -(2/3)-(15/8)+(7/12)
A = -(16/24)-(45/24)+(14/24)
A = -47/24

B = -(2/3)*(-15/8)*(7/12)
B = (30/24)*(7/12)
B = 210/288
B = 105/144

C = (-(2/3)*(-15/8))/(7/12)
C = (30/24)/(7/12)
C = (30/24)*(12/7)
C = 360/168
C = 15/7
2013-12-11T11:43:39+01:00
a=x+y-z    
=
-2/3+(-15/8)-(-7/12)
=-16/24-45/24+14/24
=-47/24

b=xyz  
=
-2/3*(-15/8)*(-7/12 )
=-210/288
=-70/96
=-35/48

c= xy/z
=
-2/3*(-15/8)/(-7/12)
=-2/3*(-15/8)*(-12/7)
=-360/168
=-120/56
=-15/7