Dacă a+b = 555, atunci c = 777-555=222
b+222=666
b=666-222=444
a+444=555
a=555-444=111
a=111 b=444 c=222
Răspuns:
a+b+c=777
a=777-b-c
a=777-b-c ; b∈R;c∈R.
a+b=555
a=555-b
a=555-b;b∈R.
b+c=666
b=666-c
b=666-c; c∈R
