来自胡亚男的问题
解方程组2x+3y-z=5x-2y+2z=63x-y-3z=7{2x+3y-z=5(1){x-2y+2z=6(2){3x-y-3z=7(3)x=?y=?z=?
解方程组2x+3y-z=5x-2y+2z=63x-y-3z=7
{2x+3y-z=5(1)
{x-2y+2z=6(2)
{3x-y-3z=7(3)
x=?y=?z=?


解方程组2x+3y-z=5x-2y+2z=63x-y-3z=7{2x+3y-z=5(1){x-2y+2z=6(2){3x-y-3z=7(3)x=?y=?z=?
解方程组2x+3y-z=5x-2y+2z=63x-y-3z=7
{2x+3y-z=5(1)
{x-2y+2z=6(2)
{3x-y-3z=7(3)
x=?y=?z=?
x=64/19
y=-4/19
z=21/19
由(1)得z=2x+3y-5将其代入(2),(3)式可算出x和y,最后将算出的xy代入可得z