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数学题:{3x+2y-z=0,x-2y+2z=3,x+2y-3z=-2
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数学题:{3x+2y-z=0,x-2y+2z=3,x+2y-3z=-2
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答案和解析
3x+2y-z=0 (1)
x-2y+2z=3 (2)
x+2y-3z=-2 (3)
(1)+(2):4x+z=3, z=3-4x (4)
(2)+(3): 2x-z=1 (5)
(4)带入(5)
2x-3+4x=1
x=2/3 (6)
(6)带入(4):z=1/3(7)
(6)(7)带入(1):2+2y-1/3=0
y=-5/6
则解得x=2/3,y=-5/6,z=1/3
x-2y+2z=3 (2)
x+2y-3z=-2 (3)
(1)+(2):4x+z=3, z=3-4x (4)
(2)+(3): 2x-z=1 (5)
(4)带入(5)
2x-3+4x=1
x=2/3 (6)
(6)带入(4):z=1/3(7)
(6)(7)带入(1):2+2y-1/3=0
y=-5/6
则解得x=2/3,y=-5/6,z=1/3
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