r2-r1,r4-r3,r3-3r1~1 -1 2 1 00 0 0 0 00 3 0 -4 10 0 0 4 0 r4/4,r1-r4,r3+4r4,r3/3~1 -1 2 1 00 0 0 0 00 1 0 0 1/30 0 0 0 0 r1+r3,交换r2r3~1 0 2 1 1/30 1 0 0 1/30 0 0 0 00 0 0 0 0 这样就得到了标准形