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$f(a)+f(b)-ab \mid af(a)+bf(b); \forall a,b\in N^{*}$

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Sangnguyen3

Sangnguyen3

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Tìm tất cả các hàm số $f:N^{*}\rightarrow N^{*}$ thỏa mãn 

$f(a)+f(b)-ab \mid af(a)+bf(b); \forall a,b\in N^{*}$

 






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