Wildan Bagus W 6 Report post Posted December 26, 2017 (edited) Tentukan semua fungai $f: \mathbb{N} \to \mathbb{N}$ yang memenuhi \[f(x + y) - f(y) =x\] Edited December 26, 2017 by Wildan Bagus W Share this post Link to post Share on other sites
OnePunchMan 1 Report post Posted December 27, 2017 set $y\leftarrow 1$ jadinya $f(x+1) = x + f(1)$. set $x\leftarrow x-1$ didapat $f(x)=x-1+f(1)$. tinggal gimana entar $f(1)$ nya. Share this post Link to post Share on other sites
