Hãy chuyển X ( Z ) về dạng phân thức tối giản X ( Z ) = a Z ( Z − a ) 2

$\text{X}\left(\text{Z}\right)=\frac{\frac{1}{a}}{Z}+\frac{\frac{1}{a}}{\left(Z-a\right)}-\frac{1}{(Z-a){}^2}$

$\text{X}\left(\text{Z}\right)=\frac{1}{aZ}-\frac{1}{a\left(Z-a\right)}+\frac{a}{(Z-a){}^2}$

$X\left(Z\right)=\frac{\frac{1}{a}}{Z}-\frac{\frac{1}{a}}{\left(Z-a\right)}-\frac{a}{(Z-a){}^2}$

$X\left(Z\right)=\frac{1}{aZ}-\frac{1}{a\left(Z-a\right)}+\frac{1}{(Z-a){}^2}$