系数行列式 A =
1 -3 0 -6
2 1 -5 1
2 0 -1 2
1 4 -7 6
= 17
A1 =
9 -3 0 -6
8 1 -5 1
-5 0 -1 2
0 4 -7 6
= 177
A2 =
1 9 0 -6
2 8 -5 1
2 -5 -1 2
1 0 -7 6
= 366
A3 =
1 -3 9 -6
2 1 8 1
2 0 -5 2
1 4 0 6
= 81
A4 =
1 -3 0 9
2 1 -5 8
2 0 -1 -5
1 4 -7 0
= -179
x1 = A1/A = 177/17
x2 = A2/A = 366/17
x3 = A3/A = 81/17
x4 = A4/A = -179/17
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