Cho x,y,z $\in \mathbb{R}$
$Min ({(x-y)^2, (y-z)^2, (z-x)^2})\leq \frac{1}{2} (x^2+y^2+z^2)$
Cho x,y,z $\in \mathbb{R}$
$Min ({(x-y)^2, (y-z)^2, (z-x)^2})\leq \frac{1}{2} (x^2+y^2+z^2)$
Cho x,y,z $\in \mathbb{R}$
$Min ({(x-y)^2, (y-z)^2, (z-x)^2})\leq \frac{1}{2} (x^2+y^2+z^2)$
de ki vay ban minh ko hieu no keu lam gi luon
Cho x,y,z $\in \mathbb{R}$
$Min ({(x-y)^2, (y-z)^2, (z-x)^2})\leq \frac{1}{2} (x^2+y^2+z^2)$
Chỉ cần c/m:$\frac{\sum \left ( x-y \right )^{2}}{3}\leq \frac{1}{2} \left ( \sum x^{2} \right )$ là ok
$\boxed{\text{Nguyễn Trực-TT-Kim Bài secondary school}}$
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