把X=5带入
则 5+5Y-2Z=-4--------------(1)
20-3y+2Z=1--------------(2)
用(1)+(2)=5+5y-2z+20-3Y+2z=-3
则 Y=-14-----------(3)
把(3)带入(1)即可
Z=-61/2
把X=5带入
则 5+5Y-2Z=-4--------------(1)
20-3y+2Z=1--------------(2)
用(1)+(2)=5+5y-2z+20-3Y+2z=-3
则 Y=-14-----------(3)
把(3)带入(1)即可
Z=-61/2