刘老师 非齐次线性方程组的通解
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刘老师 非齐次线性方程组的通解
3x1+4x2+x3+2x4=3
6x1+8x2+2x3+5x4=7
9x1+12x2+3x3+10x4=13
3x1+4x2+x3+2x4=3
6x1+8x2+2x3+5x4=7
9x1+12x2+3x3+10x4=13
![刘老师 非齐次线性方程组的通解](/uploads/image/z/2853922-58-2.jpg?t=%E5%88%98%E8%80%81%E5%B8%88+%E9%9D%9E%E9%BD%90%E6%AC%A1%E7%BA%BF%E6%80%A7%E6%96%B9%E7%A8%8B%E7%BB%84%E7%9A%84%E9%80%9A%E8%A7%A3)
x1 x2 x3 x4
3 4 1 2 3
6 8 2 5 7
9 12 3 10 13
↓r2-2r1
↓r3-3r1
x1 x2 x3 x4
3 4 1 2 3
0 0 0 1 1
0 0 0 4 4
↓r3-4r2
↓r1-2r2
x1 x2 x3 x4
3 4 1 0 1
0 0 0 1 1
0 0 0 0 0
∴得:
x1=c1
x2=c2
x3=﹣3c1-4c2+1
x4=1
∴通解为:
(x1 x2 x3 x4)=c1(1 0 ﹣3 0)+c2(0 1 ﹣4 0)+(0 0 1 1)
3 4 1 2 3
6 8 2 5 7
9 12 3 10 13
↓r2-2r1
↓r3-3r1
x1 x2 x3 x4
3 4 1 2 3
0 0 0 1 1
0 0 0 4 4
↓r3-4r2
↓r1-2r2
x1 x2 x3 x4
3 4 1 0 1
0 0 0 1 1
0 0 0 0 0
∴得:
x1=c1
x2=c2
x3=﹣3c1-4c2+1
x4=1
∴通解为:
(x1 x2 x3 x4)=c1(1 0 ﹣3 0)+c2(0 1 ﹣4 0)+(0 0 1 1)