\(A=2^{2015}-\left(2^{2014}+2^{2013}+...+2+1\right)\)
Đặt \(B=2^{2014}+2^{2013}+...+2+1\)
\(\Rightarrow2B=2^{2015}+2^{2014}+...+2^2+2\)
\(\Rightarrow2B-B=\left(2^{2015}+2^{2014}+...+2^2+2\right)-\left(2^{2014}+2^{2013}+...+2+1\right)\)\(\Rightarrow B=2^{2015}-1\)
\(\Rightarrow A=2^{2015}-2^{2015}+1\)
\(\Rightarrow A=1\)