线性代数一道求矩阵的秩的题目，求解在线等，必采纳！！急急急

Question

如题所述

Answer 1

A =
[1 1 2 2 1]
[0 2 1 5 -1]
[2 0 3 -1 3]
[1 1 0 4 -1]
初等行变换为
[1 1 2 2 1]
[0 2 1 5 -1]
[0 -2 -1 -5 1]
[0 0 -2 2 -2]
初等行变换为
[1 1 2 2 1]
[0 2 1 5 -1]
[0 0 -2 2 -2]
[0 0 0 0 0]
r(A) = 3