Question

用矩阵解题3X₁+4x₂-4x₃+2x₄=-36x₁+5x₂-2x₃+3x₄=-19x₁+3x₂+8x₃+5x₄=9-3

Answer 1

3 4 -4 2 -3

6 5 -2 3 -1

9 3 8 5 9

-3 -7 -10 1 2

化简得到

1 0 0 0 1/3

0 1 0 0 -1

0 0 1 0 1/2

0 0 0 1 1

所以x1=1/3 x2=-1 x3=1/2 x4=1