已知x+y+z=36,2x-y+z=18.求当x-y=1时,z的值
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已知x+y+z=36,2x-y+z=18.求当x-y=1时,z的值已知x+y+z=36,2x-y+z=18.求当x-y=1时,z的值已知x+y+z=36,2x-y+z=18.求当x-y=1时,z的值将
已知x+y+z=36,2x-y+z=18.求当x-y=1时,z的值
已知x+y+z=36,2x-y+z=18.求当x-y=1时,z的值
已知x+y+z=36,2x-y+z=18.求当x-y=1时,z的值
将x-y=1代入x+y+z=36得2y+z=35
代入2x-y+z=18得y+z=16
再把y+z=16代入2y+z=35得z=-3
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