2x+3y+z=33 x+2y-2z=-3 3x-y+z=12
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2x+3y+z=33 x+2y-2z=-3 3x-y+z=12
x y z分别等于?
x y z分别等于?
![2x+3y+z=33 x+2y-2z=-3 3x-y+z=12](/uploads/image/z/19835639-71-9.jpg?t=2x%2B3y%2Bz%3D33+x%2B2y-2z%3D-3+3x-y%2Bz%3D12)
2x+3y+z=33 ----(1)
x+2y-2z=-3 ----(2)
3x-y+z=12 ----(3)
(1)-(3),-x+4y=21----(4)
(2)+(3)×2,7x=21,x=3.
把x=3代入(4),-4+4y=21,4y=25,y=25/4.
把x=3,y=25/4代入(3),9-25/4+z=12,z=37/4.
x+2y-2z=-3 ----(2)
3x-y+z=12 ----(3)
(1)-(3),-x+4y=21----(4)
(2)+(3)×2,7x=21,x=3.
把x=3代入(4),-4+4y=21,4y=25,y=25/4.
把x=3,y=25/4代入(3),9-25/4+z=12,z=37/4.
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