已知xyz不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z

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已知xyz不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z

已知xyz不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z
已知xyz不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z

已知xyz不等于0,且x/3=y/4=z/5,求【2x-3(2y-z)】/x+y+z
设X/3=Y/4=Z/5=K,然后表示出X,Y,Z,再代入求解,答案应该是-1/4