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`a) 2^n + 2^(n + 2) = 160`

`2^n + 2^n . 4 = 160`

`2^n . (1 + 4) = 160`

`2^n . 5= 160`

`2^n = 32`

`2^n = 2^5`

`=> n = 5`

Vậy `n = 5`

`b) 2^n + 2^(n + 3) = 144`

`2^n + 2^n . 8 = 144`

`2^n . 9 = 144`

`2^n = 16`

`2^n = 2^4`

`=> n = 4`

Vậy `n = 4`

`c) 2^(n + 1) + 2^(n + 1) = 128`

`2 . 2^(n + 1) = 128`

`2^(n + 2) = 2^7`

`=> n + 2=  7`

`n = 7 - 2`

`n = 5`

Vậy `n = 5`

`d) 2^(n + 2) - 2^n = 192`

`2^n . 4 - 2^n = 192`

`2^n . (4 - 1) = 192`

`2^n . 3 = 192`

`2^n = 192 : 3`

`2^n = 64`

`2^n = 2^6`

`=> n = 6`

Vậy `n = 6`