1. x=10,y=9,z=2
2. 3.你都写错了
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
3个回答
相关问题
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{3x+2y+z=13 x+y+2z=7 2x+3y-z=12,求x,y,z
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{3x+2y+z=13 {x+y+z=7 {2x+3y-z=12
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x+3y-z=13,3x-2y-z=2,2x-y+z=-3
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x+2y+z=11,x+y+2z=12,2x+y+z=13
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(1)2X+4Y+3Z=93X-2Y+5Z=115X-6Y+7Z=13(2)X:Y=3:2Y:Z=5:4X+Y+Z=66
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-x+2y+3z=12 2x-2y+5z=13 3x+2y+z=10
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3x+y-2z=1,4x+2y-3z=1,2x-3y+4z=13
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2x-y=7 x+y+z=25x+3y+z=2 x-2y+z=-1 3x-4z=4 x+2y+3z=-1x+y-z=6x
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方程只要答案：1,x+y+z=2 2y-3z=1 2x-y+3z=-12,已知（x-y+2z)/3=（y-z+2x）/7