Matrix problem, Fortran

Matrix problem

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 MATRIX OF A IS=
   0.00000000       1.00000000       1.00000000    
  -1.00000000       0.00000000       1.00000000    
  -1.00000000      -1.00000000       0.00000000    
 THE SUM OF THE DIAGONALENTRIES IS=   0.00000000    
 UPPER TRIANGULAR ENTRIES SUM ARE
   3.00000000    
 SUM OF LOWER TRIANGULAR ENTRIES
  -3.00000000

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