Răspuns :
a + b + c = 15
b = a + 1
c = b + 1 = a + 1 + 1 = a + 2
a + a + 1 + a + 2 = 15
3a + 3 = 15
3a = 12
a = 12 : 3
a = 4
b = 4 + 1
b = 5
c = 5 + 1
c = 6
Proba: 4 + 5 + 6 = 15
Corect.
a + b + c = 15
b = a + 1
c = b + 1 = a + 1 + 1 = a + 2
a + a + 1 + a + 2 = 15
3a + 3 = 15
3a = 12
a = 12 : 3
a = 4
b = 4 + 1
b = 5
c = 5 + 1
c = 6
Proba: 4 + 5 + 6 = 15
Corect.