Question

So sánh: 99²⁰ và 9999¹⁰

Answer 1

\(99^{20}=\left(99^2\right)^{10}=9801^{10}< 9999^{10}\)

Answer 2

Ta có: \(99^{20}=\left(99^2\right)^{10}=9801^{10}\)

Ta thấy: \(9801< 9999\)

=> \(99^{20}< 9999^{10}\)

Answer 3

\(99^{20}=198^{10}\)

\(\Rightarrow99^{20}< 9999^{10}\)