Question

Rút gọn:

\(3\sqrt{5}+\sqrt{20}+\sqrt{5}\)

Answer 1

`3\sqrt{5}+\sqrt{20}+\sqrt{5}`

`=3\sqrt{5}+2\sqrt{5}+\sqrt{5}`

`=6\sqrt{5}`

Answer 2

\(3\sqrt{5}+\sqrt{20}+\sqrt{5}\\ =3\sqrt{5}+\sqrt{4.5}+\sqrt{5}\\ =3\sqrt{5}+2\sqrt{5}+\sqrt{5}\\ =6\sqrt{5}\)

Answer 3

\(3\sqrt{5}+\sqrt{20}+\sqrt{5}\)

\(=3\sqrt{5}+\sqrt{2^2\cdot5}+\sqrt{5}\)

\(=3\sqrt{5}+2\sqrt{5}+\sqrt{5}\)

\(=6\sqrt{5}\)