化成阶梯型矩阵
追答矩阵初等行变换为
[1 -1 0 2 -5]
[0 2 -1 -4 10]
[0 5 -1 -8 21]
[0 7 -1 -9 20]
矩阵初等行变换为
[1 -1 0 2 -5]
[0 2 -1 -4 10]
[0 10 -2 -16 42]
[0 14 -2 -18 40]
矩阵初等行变换为
[1 -1 0 2 -5]
[0 2 -1 -4 10]
[0 0 3 4 -8]
[0 0 5 10 -30]
矩阵初等行变换为
[1 -1 0 2 -5]
[0 2 -1 -4 10]
[0 0 1 2 - 6]
[0 0 0 -2 10]