(a,b,c,p)=
3 -2 1 4
-3 1 2 5
2 2 -1 6
r1+r3,r2+2r3
5 0 0 10
1 5 0 17
2 2 -1 6
r1*(1/5),r2-r1,r3-2r1
1 0 0 2
0 5 0 15
0 2 -1 2
r2*(1/5),r3-2r2
1 0 0 2
0 1 0 3
0 0 -1 -4
r3*(-1)
1 0 0 2
0 1 0 3
0 0 1 4
所以 p=2a+3b+4c
(a,b,c,p)=
3 -2 1 4
-3 1 2 5
2 2 -1 6
r1+r3,r2+2r3
5 0 0 10
1 5 0 17
2 2 -1 6
r1*(1/5),r2-r1,r3-2r1
1 0 0 2
0 5 0 15
0 2 -1 2
r2*(1/5),r3-2r2
1 0 0 2
0 1 0 3
0 0 -1 -4
r3*(-1)
1 0 0 2
0 1 0 3
0 0 1 4
所以 p=2a+3b+4c