2x-y+2z=-17 3x+y-3z=-4 x+y+z=6
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2x-y+2z=-173x+y-3z=-4x+y+z=62x-y+2z=-173x+y-3z=-4x+y+z=62x-y+2z=-173x+y-3z=-4x+y+z=62x-y+2z=-17①3x+y
2x-y+2z=-17 3x+y-3z=-4 x+y+z=6
2x-y+2z=-17 3x+y-3z=-4 x+y+z=6
2x-y+2z=-17 3x+y-3z=-4 x+y+z=6
2x-y+2z=-17 ①
3x+y-3z=-4 ②
x+y+z=6 ③
③*2:2x+2y+2z=12④
④-①:3y=29
y=29/3
带入③:x+z=-11/3⑤
带入②:3x-3z=-41/3 即x-z=-41/9⑥
⑤+⑥:2x=-74/9
x=-37/9
z=4/9
所以
x=-37/9
y=29/3
z=4/9
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2x-y+2z=-17 3x+y-3z=-4 x+y+z=6