format rat
A=hilb(4)

A =

      1           1/2          1/3          1/4     
     1/2          1/3          1/4          1/5     
     1/3          1/4          1/5          1/6     
     1/4          1/5          1/6          1/7     

b=[1 2 3 4]'

b =

      1      
      2      
      3      
      4      

x=A\b

x =

    -64      
    900      
  -2520      
   1820      

diary off