Hãy xác định Y ( Z ) = Z T [ y ( n ) ] . Nếu   Z T [ x ( n ) ] = X ( Z ) ; y ( n ) = n . x ( n )

$\text{Y}\left(\text{Z}\right)=X\left(\frac{\underset{\_}{Z}}{n}\right)$

$\text{Y}\left(\text{Z}\right)=-Z\frac{dX\left(Z\right)}{dZ}$

$Y\left(Z\right)=n\cdot X\left(Z\right)$

$\text{Y}\left(\text{Z}\right)=X\left(nZ\right)$