Tìm tất cả các hàm số $f:\mathbb{R}\rightarrow \mathbb{R}$ thỏa mãn:
$f(x+y)+f(x-y)-2f(x)f(1+y)=2xy(3y-x^{2}),\forall x,y\in \mathbb{R}$
$f(x+y)+f(x-y)-2f(x)f(1+y)=2xy(3y-x^{2}),\forall x,y\in \mathbb{R}$
Started By TrucCumgarDaklak, 26-03-2018 - 16:34
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