Áp dụng bất đẳng thức Bu - nhi - a
\(\left(1\cdot\sqrt{2016}+1\cdot\sqrt{2018}\right)^2\le\left(1^2+1^2\right)\cdot\left[\left(\sqrt{2016}\right)^2+\left(\sqrt{2018}\right)^2\right]=2\cdot4034\)
=8068
\(\Rightarrow\sqrt{2016}+\sqrt{2018}\le\sqrt{8068}=\sqrt{4\cdot2017}=2\sqrt{2017}\)
\(\)Vậy \(\sqrt{2016}+\sqrt{2018}\le2\sqrt{2017}\)