tìm f:$\mathbb{R}\rightarrow \mathbb{R}$ thỏa : $f(x+y)+f(x-y) - 2f(x)f(1+y)=2xy(3y-x^{2}$
tìm f:$\mathbb{R}\rightarrow \mathbb{R}$ thỏa : $f(x+y)+f(x-y) - 2f(x)f(1+y)=2xy(3y-x^{2}$
Started By Phan Thien, 23-11-2014 - 17:56
1 user(s) are reading this topic
0 members, 1 guests, 0 anonymous users
