Question

向量组a1=(2,-1,3,1),a2=(4,-2,5,4),a3=(2,-1,4,-1)的秩是

Answer 1

用初等行变换：

2 -1 3 1 2 -1 3 1 2 -1 3 1

4 -2 5 4 得：0 0 -1 2 得 0 0 0 2

2 -1 4 -1 0 0 1 0 0 0 1 0

秩=3.