matlab求矩阵Ax=b的解,A为3阶魔方阵,b是（3×1）全1列向量.用rref,inv/体验

matlab求矩阵Ax=b的解,A为3阶魔方阵,b是（3×1）全1列向量.用rref,inv/体验

>> A = magic(3)
A =
8 1 6
3 5 7
4 9 2
>> b = ones(3,1)
b =
1
1
1
>> x1 = inv(A)*b
x1 =
0.0667
0.0667
0.0667
>> x2 = A\b
x2 =
0.0667
0.0667
0.0667
>> [R,jb] = rref(A)
R =
1 0 0
0 1 0
0 0 1
jb =
1 2 3