已知X,Y,Z满足|3X-2Y+Z|+|2X+Y+2Z|=0(X,Y,Z≠0),求（X+Y）／Z的值
如题
要有过程
人气：343 ℃ 时间：2019-11-06 12:23:59
解答
3X-2Y+Z=0
2X+Y+2Z=0
解得X=-5z/7,Y=-4z/7
（X+Y）／Z=(-5/7-4/7)z/z=-9/7
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