Răspuns :
a + b + c = 26
b = a - 5
c = a + b = a + a - 5 = 2a -5
inlocuim:
a + a - 5 + 2a - 5 = 26 => 4a -10 = 26 => 4a = 36 => a=9
b = a - 5 = 9 -5 = 4
c = a + b = 9 + 4 = 13
V: a + b + c = 26 => 9 + 4 + 13 = 26 => 26 = 26
Răspuns:
a+b+c=26
a=b+5
c=a+b
________
b+5+b+b+5+b=26
4b=26-10
4b=16
b=16÷4
b=4
a=4+5
a=9
c=9+4
c=13
Verificare:
9+4+13=26