a/ 5 mũ n + 1 = 625 b/ 2 mũ 3 . 2 mũ x = 64 c/ 2 mũ x : 16 = 128 d/ x mũ 2015 = 1 Help

`a,`

`5^(n + 1) = 625`

`=> 5^(n + 1) = 5^4`

`=> n + 1 = 4`

`=> n = 4 - 1`

`=> n = 3`

Vậy `n = 3`

`b,`

`2^3 . 2^x = 64`

`=> 2^(3 + x) = 64`

`=> 2^(3 + x) = 2^6`

`=> 3 + x = 6`

`=> x = 6 - 3`

`=> x = 3`

Vậy `x = 3`

`c,`

`2^x : 16 = 128`

`=> 2^x = 128 . 16`

`=> 2^x = 2048`

`=> 2^x = 2^11`

`=> x = 11`

Vậy `x = 11`

`d,`

`x^2015 = 1`

`=> x^2015 = 1^2015`

`=> x = 1`

Vậy `x = 1`