计算行列式及逆矩阵

问题描述:

计算行列式及逆矩阵
4 2 1 2
2 4 2 1
1 2 4 2
2 1 2 4

行列式:81
逆矩阵:
[ 4/9,-2/9,1/9,-2/9]
[ -2/9,4/9,-2/9,1/9]
[ 1/9,-2/9,4/9,-2/9]
[ -2/9,1/9,-2/9,4/9]