求矩阵的秩就用初等行变换1 2 34 -2 12 3 23 4 01 1 0 r1-r5,r2-r5*4,r3-r5*2,r4-r5*30 1 30 -6 10 1 20 1 01 1 0 r1-r3,r2+r4*6,r3-r4,r5-r40 0 30 0 10 0 20 1 01 0 0 r1-r2*3,r3-r2*2,交换行次序1 0 00 1 00 0 10...