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www.***.com由z=k/(xy)或y=k/(xz)得xyz=k
xyz-k=0,即xyz-粒xyz=0。
当z=讨观谈英起1时,由2y+2z+yz=0,3y+2=0,y=-2/3,
由2x+2z+xz=0,3x+2=0,x =-2/3,
2y+2x=-8/3,xy=4/术持黄观思测某计字9,2y+2x+ xy=-8/3+4/9=-20/9,误差=-20/9;
当z=1/2时,由2y+2z+yz=0,(5/2)y+1=0头火早美,y=-2/5,
由2x+2z+xz=0,(5/2)x+1菜左金世持伯已=0,x =-2黑镇与掌识书变候把/5,
2y+2x=-8/5,xy=4/25,2y+2x+ xy=-8/5+4/25=-36/25,误差=-36/25;
当z=0.1时,由2y+2z+yz=0,2.1y+0.1=0,y=-0.04762
由2x+2z+xz=0,2.1x+0.1=0,x =-0.04762,
2y+2x=-严通入正感集重乡适0.19048,xy=0.0022677,2y+2x+ xy=-0.188,误差=-0.188;
当z=0.01时,由2y+2z+yz=0,2.01y+0.01=0,y=-0.004975
由2x+2z+xz=0,2.01x+0.01=0,内善经倍量x =-0.0049烟式群75,
2y+2x=-0.01770,xy=0.000025,2y+2x+ xy钟乙丰令换架苏识果找端=--0.0177,误差读号清压=-0.0177;