Question

线性代数,用克莱姆法则解方程

Answer 1

D= 2 1 -5 1

1 -3 0 -6

0 2 -1 2

1 4 -7 6

|D|= 27

D1= 8 1 -5 1

9 -3 0 -6

-5 2 -1 2

0 4 -7 6

|D1| = 81

D2 =

2 8 -5 1

1 9 0 -6

0 -5 -1 2

1 0 -7 6

|D2|= -108

D3 =

2 1 8 1

1 -3 9 -6

0 2 -5 2

1 4 0 6

|D3| = -27

D4 =

2 1 -5 8

1 -3 0 9

0 2 -1 -5

1 4 -7 0

|D4| =27

∴x1=81/27=3 x2=-108/27=-4 x3=-1 x4=1