Question

线行代数3题.1.解线性方程组｜X1+X2+X3+X4=5｜X1+2X2-X3+4X4=-2｜2X1-3X2-X3-5X

Answer 1

1.

1 1 1 1

1 2 -1 4

2 -3 -1 -5

3 1 2 11

5

-2

-2

0

求出 x=[1,2,3,-1] aa

2.

1 -1 0

-1 2 1

2 2 3

-4 -3 1

-5 -3 1

6 4 -1

1 -1 0 1 0 0

-1 2 1 0 1 0

2 2 3 0 0 1

1 -1 0 1 0 0

0 1 1 1 1 0

0 4 3 -2 0 1

1 -1 0 1 0 0

0 1 1 1 1 0

0 1 0 -5 -3 1

1 -1 0 1 0 0

0 1 0 -5 -3 1

0 1 1 1 1 0

1 0 0 -4 -3 1

0 1 0 -5 -3 1

0 0 1 6 4 -1