(2) 5分之x+2分之y=6分之5,x+y=3 6x-7y=--2.5x-2y=-0.9三元一次方程组(1)x+y+z=1,x-y+z=3,x+y-z=-1 (1)x-y=3,x+2y+z=8,2x-y-3z=1 (3) 3(2x-y)+4(x-2y)=87,2(3x-y)-3(x-y)=82麻烦再接解道题3(2x-y)+4(x-2y)=87,2(3x-y)-3(x-y)=82解三元一
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![(2) 5分之x+2分之y=6分之5,x+y=3 6x-7y=--2.5x-2y=-0.9三元一次方程组(1)x+y+z=1,x-y+z=3,x+y-z=-1 (1)x-y=3,x+2y+z=8,2x-y-3z=1 (3) 3(2x-y)+4(x-2y)=87,2(3x-y)-3(x-y)=82麻烦再接解道题3(2x-y)+4(x-2y)=87,2(3x-y)-3(x-y)=82解三元一](/uploads/image/z/318502-46-2.jpg?t=%282%29+5%E5%88%86%E4%B9%8Bx%2B2%E5%88%86%E4%B9%8By%3D6%E5%88%86%E4%B9%8B5%2Cx%2By%3D3+6x-7y%3D--2.5x-2y%3D-0.9%E4%B8%89%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84%281%29x%2By%2Bz%3D1%2Cx-y%2Bz%3D3%2Cx%2By-z%3D-1+%EF%BC%881%EF%BC%89x-y%3D3%2Cx%2B2y%2Bz%3D8%2C2x-y-3z%3D1+%283%29+3%282x-y%29%2B4%28x-2y%29%3D87%2C2%283x-y%29-3%28x-y%29%3D82%E9%BA%BB%E7%83%A6%E5%86%8D%E6%8E%A5%E8%A7%A3%E9%81%93%E9%A2%983%282x-y%29%2B4%28x-2y%29%3D87%EF%BC%8C2%283x-y%29-3%28x-y%29%3D82%E8%A7%A3%E4%B8%89%E5%85%83%E4%B8%80)
(2) 5分之x+2分之y=6分之5,x+y=3 6x-7y=--2.5x-2y=-0.9三元一次方程组(1)x+y+z=1,x-y+z=3,x+y-z=-1 (1)x-y=3,x+2y+z=8,2x-y-3z=1 (3) 3(2x-y)+4(x-2y)=87,2(3x-y)-3(x-y)=82麻烦再接解道题3(2x-y)+4(x-2y)=87,2(3x-y)-3(x-y)=82解三元一
(2) 5分之x+2分之y=6分之5,x+y=3 6x-7y=--2.5x-2y=-0.9
三元一次方程组(1)x+y+z=1,x-y+z=3,x+y-z=-1 (1)x-y=3,x+2y+z=8,2x-y-3z=1 (3) 3(2x-y)+4(x-2y)=87,2(3x-y)-3(x-y)=82
麻烦再接解道题3(2x-y)+4(x-2y)=87,2(3x-y)-3(x-y)=82解三元一次方程组(1)x+y+z=1,x-y+z=3,x+y-z=-1 (1)x-y=3,x+2y+z=8,2x-y-3z=1
(2) 5分之x+2分之y=6分之5,x+y=3 6x-7y=--2.5x-2y=-0.9三元一次方程组(1)x+y+z=1,x-y+z=3,x+y-z=-1 (1)x-y=3,x+2y+z=8,2x-y-3z=1 (3) 3(2x-y)+4(x-2y)=87,2(3x-y)-3(x-y)=82麻烦再接解道题3(2x-y)+4(x-2y)=87,2(3x-y)-3(x-y)=82解三元一
1 X=2 Y=-1 Z= 0
2 X=4 Y=1 Z=2
3 X=23 Y=13
1X=2 Y=-1 Z= 0
2 X=4 Y=1 Z=2
3 X=23 Y=13
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1x=2y=1z=0
2x=4y=1z=2
3x=23y=13
先消去X或Y,就可解的Y或X,下面的同理
1 X=2 Y=-1 Z= 0
2 X=4 Y=1 Z=2
3 X=23 Y=13
X=2 Y=-1 Z= 0
X=4 Y=1 Z=2
X=23 Y=13