Răspuns:
Explicație pas cu pas:
a+b=3/6
b+c=5/6
a+b+c=1
Inlocuim in expresie
3/6+c=1
c=1-3/6=(6-3)/6=3/6=1/2
c=1/2
a+5/6=1
a=1-5/6=(6-5)/6=1/6
a=1/6
1/6+b+1/2=1
b=1-(1/2+1/6)
b=1-(3+1)/6
b=1-4/6=(6-4)/6=2/6=1/3
b=1/3
a+b+c=1
1/6+2/6+1/2=1
(1+2+3)/6=1
6/6=1
1=1