求下列方阵逆矩阵1 2 32 2 13 4 3

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求下列方阵逆矩阵1 2 32 2 13 4 3
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求下列方阵逆矩阵1 2 32 2 13 4 3
求下列方阵逆矩阵
1 2 3
2 2 1
3 4 3

求下列方阵逆矩阵1 2 32 2 13 4 3
1 2 3 1 0 0
2 2 1 0 1 0
3 4 3 0 0 1
r2-2r1.r3-3r1
1 2 3 1 0 0
0 -2 -5 -2 1 0
0 -2 -6 -3 0 1
r1+r2,r3-r2
1 0 -2 -1 1 0
0 -2 -5 -2 1 0
0 0 -1 -1 -1 1
r1-2r3,r2-5r3
1 0 0 1 3 -2
0 -2 0 3 6 -5
0 0 -1 -1 -1 1
(-1/2)r2,(-1)r3
1 0 0 1 3 -2
0 1 0 -3/2 -3 5/2
0 0 1 1 1 -1
所以逆矩阵为
1 3 -2
-3/2 -3 5/2
1 1 -1

1 2 3 1 2 3 1 2 3
2 2 1 = 0 -2 -5 = 0 -2 -5 =1*(-2)*(-1)=2
3 4 3 0 -2 -6 0 0 -1
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