Tìm $f:R\rightarrow R$ thõa mãn $(x-2)f(y)+f(y+2f(x))= f(x+yf(x))$
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Tìm $f:R\rightarrow R$ thõa mãn $(x-2)f(y)+f(y+2f(x))= f(x+yf(x))$
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