Question

So sánh \(4^{127}\)và \(81^{43}\)

Answer 1

Ta có 4¹²⁷=(4³)⁴²*4=64⁴²*4

         81⁴³=81⁴²*81

81⁴²>64⁴²   ;    81>4

\(\Rightarrow81^{42}\cdot81>64^{42}\cdot4\Rightarrow81^{43}>4^{127}\)

Answer 2

4 ¹²⁷< 4¹²⁹=(4³)⁴³=64⁴³

Vi 64⁴³<81⁴³

=.> 4¹²⁷< 81⁴³