Hãy tìm x ( n ) biết. X ( Z ) = 1 Z 2 + Z Z − 1 2   với | Z | > 1 2

$\text{x}\left(\text{n}\right)=\text{u}\left(\text{n}-2\right)+\left(\frac{1}{2}\right){}^n\text{u}\left(\text{n}\right)$

$\text{x}\left(\text{n}\right)=\delta \left(\text{n}-2\right)+\left(\frac{1}{2}\right){}^n\text{u}\left(\text{n}\right)$

$\text{x}\left(\text{n}\right)=\text{u}\left(\text{n}-2\right)+\left(\frac{1}{2}\right){}^n\text{u}\left(\text{n}-1\right)$

$\text{x}\left(\text{n}\right)=\delta \left(\text{n}-2\right)+\left(\frac{1}{2}\right){}^n\text{u}\left(\text{n}-1\right)$