X+Y-Z=6 (1)X-3Y+2Z=1 (2)3X+2Y-Z=4(3)(1)×2+(2)得 3x-y=13(4)(3)-(1)得 2x+y=-2(5)(4)+(5)得 5x=11x=2.2代入(5)得 4.4+y=-2y=-6.4x=2.2,y=-6.4代入(1)得2.2-6.4-z=6z=-10.2∴﹛x=2.2,y=-6.4, ...