设A=
(-12-1
1-1O
-211)
则Ax=0的通解为_____.
{x1=x3 {x2=x3 {x3=x3, 解析: 对A进行初等行变换 A= (-1 2 -1 1 -1 0 -2 1 1) → (1 -1 0 0 1 -1 0 -1 1) → (1 0 -1 0 1 -1 0 0 0) 所以原方程组同解于 {x1-x3=0 {x2-x3=0 即通解为 {x1=x3 {x2=x3 {x3=x3
设A=
(-12-1
1-1O
-211)
则Ax=0的通解为_____.
{x1=x3 {x2=x3 {x3=x3, 解析: 对A进行初等行变换 A= (-1 2 -1 1 -1 0 -2 1 1) → (1 -1 0 0 1 -1 0 -1 1) → (1 0 -1 0 1 -1 0 0 0) 所以原方程组同解于 {x1-x3=0 {x2-x3=0 即通解为 {x1=x3 {x2=x3 {x3=x3