X+2y+z=2,X+y+2z=5,二x+y+z=9,求Xyz的值
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x + 2y + z = 2 .............(1)
x + y + 2z = 5 .............(2)
2x + y + z = 9 .............(3)
(1) + (2) + (3) 整理得:x + y + z = 4 .............(4)
(3) - (4) 得:x = 5
(1) - (4) 得:y = -2
(2) - (4) 得:z = 1
x = 5 ,y = -2 ,z = 1
x + y + 2z = 5 .............(2)
2x + y + z = 9 .............(3)
(1) + (2) + (3) 整理得:x + y + z = 4 .............(4)
(3) - (4) 得:x = 5
(1) - (4) 得:y = -2
(2) - (4) 得:z = 1
x = 5 ,y = -2 ,z = 1
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