Question

so sánh các số sau:

Answer 1

7: \(2\sqrt{5}=\sqrt{20}>\sqrt{19}\)

8: \(3\sqrt{10}=\sqrt{90}>\sqrt{80}=4\sqrt{5}\)

9: \(3\sqrt{10}>4\sqrt{5}\)

nên \(-3\sqrt{10}< -4\sqrt{5}\)

10: \(2=\sqrt{4}< \sqrt{5}\)

11: \(\sqrt{7}< \sqrt{9}=3\)

12: \(6=\sqrt{36}< \sqrt{41}\)

Answer 2

\(2\sqrt{5}>\sqrt{19};3\sqrt{10}>4\sqrt{5};-3\sqrt{10}< 4\sqrt{5}\)

\(2< \sqrt{5};\sqrt{7}< 3;6< \sqrt{41}\)