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若实数xyz满足(x–z)^–4(x–y)(y–z)=0,xyz怎么求,

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若实数xyz满足(x–z)^–4(x–y)(y–z)=0,xyz怎么求,
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答案和解析
原等式可变为:
(x-y+y-z)^2-4(x-y)(y-z)=0 =>(x-y)^2+2(x-y)(y-z)-4(x-y)(y-z)+(y-z)^2=0
=>(x-y-y+z)^2=0 由实数平方大于等于0可知:x+z=2y
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