Question

khong tinh hay so sanh 8^3 va 9^2

 

Answer 1

Ta có: 

8³ = (2³)³ = 2⁹ =  2⁸ . 2 = (2²)⁴ . 2 = 4⁴ . 2

9² = (3²)² = 3⁴

Vì 4⁴ > 3⁴ => 4⁴ . 2 > 3⁴

=> 8³ > 9²

Answer 2

Ta có: 

8³ = (2³)³ = 2⁹ =  2⁸ . 2 = (2²)⁴ . 2 = 4⁴ . 2

9² = (3²)² = 3⁴

Vì 4⁴ > 3⁴ => 4⁴ . 2 > 3⁴

=> 8³ > 9²

Answer 3

Ta có: 

8³ = (2³)³ = 2⁹ =  2⁸ . 2 = (2²)⁴ . 2 = 4⁴ . 2

9² = (3²)² = 3⁴

Vì 4⁴ > 3⁴ => 4⁴ . 2 > 3⁴

=> 8³ > 9²