Răspuns :
a=2b
c=a+b
c-b=18
a=?
b=?
c=?
c-b=18 => c=b+18
c=a+b
c=18+b => a=18
b=a:2
b=18:2
b=9
c=a+b
c=18+9
c=27
Raspuns: a=18
b=9
c=27
a,b,c
a=2b
c=a+b
c-b=18
c=a+b => c-b =a... c-b = 18 =>a=18
a=2b => b=18/2 = 9
c=a+b = 9+18 = 27
a=2b
c=a+b
c-b=18
c=a+b => c-b =a... c-b = 18 =>a=18
a=2b => b=18/2 = 9
c=a+b = 9+18 = 27