o vetor b(i) eh:
 b(i)=       4.000000000000000        3.000000000000000
   0.000000000000000E+000        1.000000000000000      -54.000000000000000
       82.000000000000000
 a matriz l(i,j) eh
 linha           1
       15.000000000000000   0.000000000000000E+000   0.000000000000000E+000
   0.000000000000000E+000   0.000000000000000E+000   0.000000000000000E+000
 linha           2
   3.750000000000000E-001       15.000000000000000   0.000000000000000E+000
   0.000000000000000E+000   0.000000000000000E+000   0.000000000000000E+000
 linha           3
   7.500000000000000E-001   1.492537313432836E-001       15.000000000000000
   0.000000000000000E+000   0.000000000000000E+000   0.000000000000000E+000
 linha           4
        2.250000000000000   4.477611940298508E-001  -4.492448590688019E-001
       15.000000000000000   0.000000000000000E+000   0.000000000000000E+000
 linha           5
        2.625000000000000        1.218905472636816       -2.799852100457920
        1.004028061647241       15.000000000000000   0.000000000000000E+000
 linha           6
   2.250000000000000E-001   8.407960199004977E-001   5.189425182741262E-001
        1.584244600342485       -2.035539733734209       15.000000000000000
 a matriz u(i,j) eh
 linha           1
        1.333333333333333  -2.000000000000000E-001   0.000000000000000E+000
  -2.666666666666667E-001   3.333333333333333E-001  -1.000000000000000E-001
 linha           2
   0.000000000000000E+000        1.005000000000000  -1.066666666666667E-001
  -2.400000000000000E-001   2.250000000000000E-001   3.558333333333333E-001
 linha           3
   0.000000000000000E+000   0.000000000000000E+000       -2.332271973466003
   8.238805970149254E-002   2.877611940298507E-001   6.147927031509121E-001
 linha           4
   0.000000000000000E+000   0.000000000000000E+000   0.000000000000000E+000
        1.716298339922447  -1.014314021066204E-001   3.227909402049736E-001
 linha           5
   0.000000000000000E+000   0.000000000000000E+000   0.000000000000000E+000
   0.000000000000000E+000   5.172183350825830E-001   2.150673521270262E-001
 linha           6
   0.000000000000000E+000   0.000000000000000E+000   0.000000000000000E+000
   0.000000000000000E+000   0.000000000000000E+000        2.622044867508005
 o produto de l por u eh a matriz p(i,j) abaixo
 linha           1
       20.000000000000000       -3.000000000000000   0.000000000000000E+000
       -4.000000000000000        5.000000000000000       -1.500000000000000
 linha           2
   5.000000000000000E-001       15.000000000000000       -1.600000000000000
       -3.700000000000000        3.500000000000000        5.300000000000000
 linha           3
        1.000000000000000   0.000000000000000E+000      -35.000000000000000
        1.000000000000000        4.600000000000000        9.199999999999999
 linha           4
        3.000000000000000   0.000000000000000E+000        1.000000000000000
       25.000000000000000  -8.000000000000000E-001        4.500000000000000
 linha           5
        3.500000000000000   7.000000000000001E-001        6.400000000000000
   4.999999999999998E-001        8.000000000000000        2.000000000000000
 linha           6
   3.000000000000000E-001   8.000000000000000E-001       -1.300000000000000
        2.500000000000000  -8.000000000000000E-001       40.000000000000000
 a solucao eh
 x(          1)=       2.304661320451020
 x(          2)=       1.040808560574572
 x(          3)= -4.956930669037645E-001
 x(          4)= -8.087065916615781E-001
 x(          5)=      -7.874472351037947
 x(          6)=       1.888843559168843