xy+2y-z=360 xy=360-2y+z(1)xy-8y-z=-48 xy=8y+z-48(2) (2)-(1)得10y=-408 y=-40.8代入（1）（2）得xy=441.6+z(3) xy=z-374.4(4) (3)-(4)无解.
(x+2)*y=z+360 x*(y-8)=z-48 求x/y/z各是多少?
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