3x+2y+z=3 2x=4-3z=-8 x+y-2z=-4 2x+y+3z=7
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3x+2y+z=32x=4-3z=-8x+y-2z=-42x+y+3z=73x+2y+z=32x=4-3z=-8x+y-2z=-42x+y+3z=73x+2y+z=32x=4-3z=-8x+y-2z=
3x+2y+z=3 2x=4-3z=-8 x+y-2z=-4 2x+y+3z=7
3x+2y+z=3 2x=4-3z=-8 x+y-2z=-4 2x+y+3z=7
3x+2y+z=3 2x=4-3z=-8 x+y-2z=-4 2x+y+3z=7
3x+2y+z=3 ①
2x+4y-3z=-8 ②
x+y-2z=-4 ③
2x+y+3z=7 ④
②-④,得 3y-6z=-15 ⑤
④-2③,得 -y+7z=15 ⑥
⑤+3⑥,得 z=2 ⑦
将⑦代入⑥中,得 y= -1 ⑧
将⑦,⑧代入③中,得 x=1 。
∴ x=1 ,y= -1 , z=2 。
2x=4-3z=-8 这个公式你输错了吧
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