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.{3x+y-z=4,2x-y=3,x+y+z=6,求xyz=?
题目详情
.{3x+y-z=4,2x-y=3,x+y+z=6 ,求xyz=?
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答案和解析
3x+y-z=4 (1)
2x-y=3 (2)
x+y+z=6 (3)
(1)+(3)得:
4x+2y=10
2x+y=5 (4)
(2)+(4)得:
4x=8
x=2
y=1
z=3
xyz=2*1*3=6
2x-y=3 (2)
x+y+z=6 (3)
(1)+(3)得:
4x+2y=10
2x+y=5 (4)
(2)+(4)得:
4x=8
x=2
y=1
z=3
xyz=2*1*3=6
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