I 1 3 0 I I 7 I I 0 1 -1 I X= I 2 I求X.大哥大姐,用矩阵的初等变换写~I 2 1 5 I I 4 I

问题描述:

I 1 3 0 I I 7 I I 0 1 -1 I X= I 2 I求X.大哥大姐,用矩阵的初等变换写~I 2 1 5 I I 4 I

1 3 0 7
0 1 -1 2
2 1 -5 4
r3 - 2r1
1 3 0 7
0 1 -1 2
0 -5 -5 -10
r1-3r2,r3+5r2
1 0 3 1
0 1 -1 2
0 0 -10 0
r3*(-1/10)
1 0 3 1
0 1 -1 2
0 0 1 0
r1-3r3,r2+r3
1 0 0 1
0 1 0 2
0 0 1 0
X = (1,2,0)^T.