Chap 7 Designed Question 2

A = {{1, 3, 2}, {0, 2, 0}, {5, 0, 1}};
Print["A=", MatrixForm[A]]; 
    Print["Inverse[A]=", 
      Inverse[A] // MatrixForm]
Ainv = {{-1/9, 1/6, 2/9}, {0, 1/2, 
            0}, {5/9, -5/6, -1/9}};
Print["Ainv=", Ainv // MatrixForm];
Print[A . Ainv // MatrixForm];
Print[
        Ainv . A // 
          MatrixForm];