Question

So sánh \(3\sqrt{5}\) và \(2\sqrt{10}\)

Answer 1

\(3\sqrt{5}=\sqrt{3^2.5}=\sqrt{45}\)

\(2\sqrt{10}=\sqrt{2^2.10}=\sqrt{40}\)

thấy \(45>40=>\sqrt{45}>\sqrt{40}=>3\sqrt{5}>2\sqrt{10}\)

Answer 2

\(3\sqrt{5}=\sqrt{45}\)

\(2\sqrt{10}=\sqrt{40}\)

mà 45>40

nên \(3\sqrt{5}>2\sqrt{10}\)