Question

线性方程组的简单题 求讲解

Answer 1

增广矩阵 （A,b）=

[1 1 2 2 2]

[2 2 4 -1 -1]

[1 1 2 5 5]

行初等变换为

[1 1 2 2 2]

[0 0 0 -5 -5]

[0 0 0 3 3]

行初等变换为

[1 1 2 2 2]

[0 0 0 1 1]

[0 0 0 0 0]

r(A,b)=r(A)=2