Question

so sánh: 9²⁰  và 27¹³

Answer 1

\(9^{20}=\left(3^2\right)^{20}=3^{40}\)

\(27^{13}=\left(3^3\right)^{13}=3^{39}\)

Vì\(3^{40}>3^{39}\Rightarrow9^{20}>27^{13}\)

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Answer 2

Ta có :

\(9^{20}=\left(3^2\right)^{20}=3^{2.20}=3^{40}\)

\(27^{13}=\left(3^3\right)^{13}=3^{3.13}=3^{39}\)

Vì \(3^{39}< 3^{40}\Rightarrow27^{13}< 9^{20}\)

Answer 3

Ta có :

\(9^{20}\)=   \(\left(3^2\right)^{20}\)=   \(3^{40}\)

\(27^{13}\)=   \(\left(3^3\right)^{13}\)=   \(3^{39}\)

Vì  \(3^{40}\)>   \(3^{39}\)

Nên  \(9^{20}\)>   \(27^{13}\)

Answer 4

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