4x+3y+z=8.1,x+4y+3z=16,.23x+y+4z=24.31式+2式+3式得8(x+y+z)=48x+y+z=6.4将4式代入1式得3x+2y+x+y+z=83x+2y+6=83x+2y=2.5将4式代入2式得x+4y+3z=163x-2x+3y+y+3z=163(x+y+z)-2x+y=163*6-2x+y=16-2x+y=-22x-y=2.65...