1) taco \(2\sqrt{5}=\sqrt{20}\)
\(Mak\sqrt{20}>\sqrt{19}\)
\(\Rightarrow2\sqrt{5}>\sqrt{19}\)
2)\(Tacó3\sqrt{10}=\sqrt{90},4\sqrt{5}=\sqrt{100}\)
\(Mà\sqrt{100}>\sqrt{90}\Rightarrow4\sqrt{5}>3\sqrt{10}\)
3)\(Tacó-3\sqrt{10}=-\sqrt{90},-4\sqrt{5}=-\sqrt{100}\)
\(Mà-\sqrt{90}>-\sqrt{100}\Rightarrow-3\sqrt{10}>-4\sqrt{5}\)
4)Ta có\(3>2\)
\(\Rightarrow\sqrt{3}>\sqrt{2}=>\sqrt{\sqrt{3}}>\sqrt{\sqrt{2}}\)