c)

- Hướng dẫn giải

c) $2^{2016}.2^{x-1}=2^{2015}$

$2^{x-1}=2^{2015}:2^{2016}$

$2^{x-1}=2^{2015-2016}$

$2^{x-1}=2^{-1}$

⇒ x – 1 = -1

x = -1 + 1

x = 0