x+2z=3 2y+z=7 2x-y-z=-5怎么解?
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x+2z=3 2y+z=7 2x-y-z=-5怎么解?
![x+2z=3 2y+z=7 2x-y-z=-5怎么解?](/uploads/image/z/16081710-6-0.jpg?t=x%2B2z%3D3+2y%2Bz%3D7+2x-y-z%3D-5%E6%80%8E%E4%B9%88%E8%A7%A3%3F)
x+2z=3 (1)
2y+z=7 (2)
2x-y-z=-5 (3)
(1)*2-(3)得
y+5z=11 (4)
(4)*2-(2)得
9z=15, z=5/3
y=11-5*5/3=8/3
x=3-2*5/3=-1/3
2y+z=7 (2)
2x-y-z=-5 (3)
(1)*2-(3)得
y+5z=11 (4)
(4)*2-(2)得
9z=15, z=5/3
y=11-5*5/3=8/3
x=3-2*5/3=-1/3
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
x/2=y/3=z/5 x+3y-z/x-3y+z
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