Az [i]x[/i], [i]y[/i] valós számok esetén [i]D[/i]([i]x[/i]; [i]y[/i]) = [i]x[/i] + [i]y[/i] + [i]xy[/i]. Mennyi[br][math]D\left(\frac{1}{2};D\left(\frac{1}{3};D\left(\frac{1}{4};D\left(...\frac{1}{2027}\right)...\right)\right)\right)[/math][br][right]Ötlet: [url=https://mail.google.com/mail/u/0/#inbox/FMfcgzQgMCgJSRjfqHrNVMGhsHhWWDWP]Quora[/url][/right][right][/right]