a: \(\sqrt{5-2.5}>0\)
b: \(4\sqrt{5}=\sqrt{80}>\sqrt{75}=5\sqrt{3}\)
nên \(\sqrt{4\sqrt{5}}>\sqrt{5\sqrt{3}}\)
d: \(\left(2+\sqrt{2}\right)^2=6+4\sqrt{2}\)
\(\left(5-\sqrt{3}\right)^2=28-10\sqrt{6}\)
mà \(6+4\sqrt{2}>28-10\sqrt{6}\)
nên 2+căn 2>5-căn 3