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Posted by Bolshevik on 15-02-2019 - 11:20
$4S=4xy=\left ( x+y \right )^{2}+(x-y)^{2}$
Không mất tính tổng quát, giả sử$y-x\geq 1\Rightarrow 4xy\leq 2017^{2}-1$