大一线性代数题目，用高斯消元法求解下列方程组

A =
2 -3 6 2 -5 3
0 1 -4 1 0 1
0 0 0 1 -3 2

=
1 0 -3 0 5 -2
0 1 -4 0 3 -1
0 0 0 1 -3 2

∴
x1 = 3x3 - 5x5 -2
x2 = 4x3 - 3x5 -1
x4 = 3x5 + 2