Trích:
Nguyên văn bởi leviethai  Thanks for your proof.
But I think the system should be
$a^2-ax=b^2-by=c^2-cz=ax+by+cz $ |
Oh that's right, perhaps I'm sleepy then can't concentrate.
Similarly to the above, the system also has only solution because $D=3abc>0 $.
Thanks for your recommendation!
Poincare,
[RIGHT][I][B]Nguồn: MathScope.ORG[/B][/I][/RIGHT]