Question

刘老师这题怎么做？

Answer 1

(α1,α2,α3,α4,β) =
1 1 1 1 1
1 1 -1 -1 2
1 -1 1 -1 1
1 -1 -1 1 1
ri-r1,i=2,3,4
1 1 1 1 1
0 0 -2 -2 1
0 -2 0 -2 0
0 -2 -2 0 0
ri*(-1/2),i=2,3,4
1 1 1 1 1
0 0 1 1 -1/2
0 1 0 1 0
0 1 1 0 0
r1-r4,r4-r3
1 0 0 1 1
0 0 1 1 -1/首毁2
0 1 0 1 0
0 0 1 -1 0
r4-r2
1 0 0 1 1
0 0 1 1 -1/2
0 1 0 1 0
0 0 0 -2 1/2
r4*(-1/2),r1-r4,r2-r4,r3-r4
1 0 0 0 5/4
0 0 1 0 -1/4
0 1 0 0 1/4
0 0 0 1 -1/4
r2<->r3
1 0 0 0 5/袭银4
0 1 0 0 1/拍芹宴4
0 0 1 0 -1/4
0 0 0 1 -1/4
所以 β=5/4α1+1/4α2-1/4α3-1/4α4