å¢å¹¿ç©éµ=
1 5 -1 -1 -1
1 -2 1 3 3
3 8 -1 1 1
1 -9 3 7 7
r2-r1,r3-3r1,r4-r1
1 5 -1 -1 -1
0 -7 2 4 4
0 -7 2 4 4
0 -14 4 8 8
r3-r2,r4-2r2
1 5 -1 -1 -1
0 -7 2 4 4
0 0 0 0 0
0 0 0 0 0
r2*(-1/7),r1-5r2
1 0 3/7 13/7 13/7
0 1 -2/7 -4/7 -4/7
0 0 0 0 0
0 0 0 0 0
é解为: (13/7,-4/7,0,0)^T+c1(-3,2,7,0)^T+c2(-13,4,0,7)^T,
c1,c2为任æ常æ°.
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