Question

在线等,急!!!!!!!!!!!麻烦解答这道工程数学题:

详细点,直接给出答题答案.谢谢.!!!

Answer 1

解: (A,B) =
1 2 2 1 2
-1 -1 0 -1 1
1 3 5 0 4

r2+r1,r3-r1
1 2 2 1 2
0 1 2 0 3
0 1 3 -1 2

r1-2r2,r3-r2
1 0 -2 1 -4
0 1 2 0 3
0 0 1 -1 -1

r1+2r3,r2-2r3
1 0 0 -1 -6
0 1 0 2 5
0 0 1 -1 -1

X =
-1 -6
2 5
-1 -1

满意请采纳

Answer 2

x=A^-1*B
-5 -4 2
求A^-1= 5 3 -2
-2 -1 1
所以X=
-1 -6
2 5
-1 -1

Answer 3

AX=B
∴X=(A^-1)*B
A^-1= -5 -4 2
5 3 -2
-2 -1 1
X= -1 -6
2 5
-1 -1