解方程组{3x+2y=1,2x-y+2z=-4,x+2y-z=3.
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解方程组{3x+2y=1,2x-y+2z=-4,x+2y-z=3.
![解方程组{3x+2y=1,2x-y+2z=-4,x+2y-z=3.](/uploads/image/z/4663309-13-9.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%84%7B3x%2B2y%3D1%2C2x-y%2B2z%3D-4%2Cx%2B2y-z%3D3.)
3x+2y=1 (1)
2x-y+2z=-4 (2)
x+2y-z=3 (3)
(1)+(2)×2
4x+3y=2 (4)
(4)-(1)
x+y=1 (5)
(1)-(5)×2
3x+2y-2x-2y=1-2
x=-1
y=1-x=2
z=x+2y-3=0
2x-y+2z=-4 (2)
x+2y-z=3 (3)
(1)+(2)×2
4x+3y=2 (4)
(4)-(1)
x+y=1 (5)
(1)-(5)×2
3x+2y-2x-2y=1-2
x=-1
y=1-x=2
z=x+2y-3=0
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
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