Răspuns :
b si c ultimele doua numere
b=253486+256145=509631
b=c+405644 => c=b-405644 => c=103987
suma: 253486+103987+509631=867104
b=253486+256145=509631
b=c+405644 => c=b-405644 => c=103987
suma: 253486+103987+509631=867104
a+b+c=?
a=253486
b=253486+256145
c=b+405644
_________________________________
b=509631
c=509631-405644
c=103987
a+b+c
253486+509631+103987=867104
a=253486
b=253486+256145
c=b+405644
_________________________________
b=509631
c=509631-405644
c=103987
a+b+c
253486+509631+103987=867104