Question

So sánh:3²¹ và 4¹⁴

Answer 1

Ta có:3^21=(3^3)7=27^7

         4^14=(4^2)^7=16^6

Vì 16<27 nên =>3^21>4^14

Vậy 3^21>4^14

Answer 2

3²¹=(3³)⁷=27⁷

4¹⁴=(4²)⁷=16⁷

=>3²¹>4¹⁴

Answer 3

\(3^{21}=\left(3^3\right)^7=9^7\)

\(4^{14}=\left(4^2\right)^7=16^7\)

Vì \(9^7< 16^7\Rightarrow3^{21}< 4^{14}\)

Answer 4

\(3^{21}=\left(3^3\right)^7=27^7\)

\(4^{14}=\left(4^2\right)^7=16^7\)

mà \(27^7>16^7\)

\(\Rightarrow3^{21}>4^{14}\)