求阶梯矩阵与行简化阶梯型矩阵,这是两个问题,

2 -1 3 14 -2 5 4-4 2 -6 -22 -1 4 0r3+r2,r2-2r1,r4-r12 -1 3 10 0 -1 20 0 -1 20 0 1 -1r3-r2,r4+r22 -1 3 10 0 -1 20 0 0 00 0 0 1-->2 -1 3 10 0 -1 20 0 0 10 0 0 0(这是梯矩阵)r1-r3,r2-2r3,r1+3r2,r1*(1/2),r...