求矩阵列解答,如图
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5. 解: X=A^-1B= (1/2)*
0 -2 3 0
1 1 * 0 2
=
0 -2
3/2 1
==================================================
6. 解: 增广矩阵=
1 1 -2 -1 1
2 1 -2 -3 2
1 3 -1 -2 0
r2-2r1,r3-r1
1 1 -2 -1 1
0 -1 2 -1 0
0 2 1 -1 -1
r1+r2,r3-2r2
1 0 0 -2 1
0 -1 2 -1 0
0 0 5 -3 -1
r2*(-1),r3*(1/5),r2+2r3
1 0 0 -2 1
0 1 0 -1/5 2/5
0 0 1 -3/5 -1/5
方程组的通解为: (1,2/5,-1/5,0)^T + c(2,1/5,3/5,1)^T.
0 -2 3 0
1 1 * 0 2
=
0 -2
3/2 1
==================================================
6. 解: 增广矩阵=
1 1 -2 -1 1
2 1 -2 -3 2
1 3 -1 -2 0
r2-2r1,r3-r1
1 1 -2 -1 1
0 -1 2 -1 0
0 2 1 -1 -1
r1+r2,r3-2r2
1 0 0 -2 1
0 -1 2 -1 0
0 0 5 -3 -1
r2*(-1),r3*(1/5),r2+2r3
1 0 0 -2 1
0 1 0 -1/5 2/5
0 0 1 -3/5 -1/5
方程组的通解为: (1,2/5,-1/5,0)^T + c(2,1/5,3/5,1)^T.
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