[i]a[/i][sup]2[/sup] + [i]b[/i][sup]2[/sup] + [i]c[/i][sup]2[/sup] + [i]d[/i][sup]2[/sup] = 858[br][i]ab[/i] + [i]cd[/i] = 344[br][i]ac[/i] + [i]bd[/i] = 104[br][i]ad[/i] + [i]bc[/i] = 91[br][br]Mennyi [i]abcd[/i]?[br][right]Ötlet: [url=https://mail.google.com/mail/u/0/#inbox/FMfcgzQgLrqbxlKntHRbVjmcSnDrFLKm]Quora[/url][/right]