1
     1

>> A

A =

    2.5000    1.2500    0.8333    0.6250    0.5000    0.4167
    1.6667    1.0000    0.7143    0.5556    0.4545    0.3846
    1.2500    0.8333    0.6250    0.5000    0.4167    0.3571
    1.0000    0.7143    0.5556    0.4545    0.3846    0.3333
    0.8333    0.6250    0.5000    0.4167    0.3571    0.3125
    0.7143    0.5556    0.4545    0.3846    0.3333    0.2941

>> A*x

ans =

    6.1250
    4.7757
    3.9821
    3.4423
    3.0446
    2.7365

>> b = A*x

b =

    6.1250
    4.7757
    3.9821
    3.4423
    3.0446
    2.7365

>> format long
>> b = A*x

b =

   6.12500000000000
   4.77566877566878
   3.98214285714286
   3.44233544233544
   3.04464285714286
   2.73645308939427

>> b = A*x