1式-2式得到X-Y=-1
3式-2式得到Z-Y=-3
1式+2式+3式=4（X+Y+Z）=44
x+y+z=11
X=4;Y=5;Z=2
2x+y+z=15,x+2y+z=16,x+y+2z=13
4个回答
相关问题
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x+y+z=15 x+2y+z=16 2x+y+z=7
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1.x+y+z=21,x-y=1,2x+z-y=13.2.3x+2y+z=13,x+y+2z=7 ,2z+3y-z=12
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x+2y+z=11,x+y+2z=12,2x+y+z=13
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2x+y+z=11,x+2y+z=16,x+y+2z=17
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1,{2x+y+z=-26,x+2y+z=-30,x+y+2z=-28 2,{5x+2y+z=12,4x+3y+z=13
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{15x-3y+2z=1 3x+4y-z=-18 z=13
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解下列方程组:(1){2x+y-z=2,x+2y-z=5,x-y+z=-5;(2){2x+y+z=15,x+2y-z=5