Cho $x,y,z \in [2020,2021]$. Tìm Max
$P = \frac{|2020.2021-xy|}{(x+y)z}+\frac{|2020.2021-yz|}{(y+z)x}+\frac{|2020.2021-zx|}{(z+x)y}$
Cho $x,y,z \in [2020,2021]$. Tìm Max
$P = \frac{|2020.2021-xy|}{(x+y)z}+\frac{|2020.2021-yz|}{(y+z)x}+\frac{|2020.2021-zx|}{(z+x)y}$
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