Question

bạn nào bày cho mình cách tính ra kq

\(\sqrt{20}=2\sqrt{5}\)

Answer 1

\(\sqrt{20}=\sqrt{4.5}=\sqrt{2^2.5}=\left|2\right|.\sqrt{5}=2\sqrt{5}\)

Answer 2

\(\sqrt{20}=\sqrt{4.5}=\sqrt{2^2.5}=\sqrt{2^2}.\sqrt{5}=2\sqrt{5}\)

Answer 3

\(\sqrt{20}=\sqrt{4.5}=2\sqrt{5}\)

 

Answer 4

\(\sqrt{20}=\sqrt{2^2\cdot5}=2\sqrt{5}\)