July 2022 1 7 Report

Очень нужна ваша помощь !!!

Докажите тождество:

 

      1               1              1

_______ - ________- _______  = 0 

(x-y)(y-z)   (y-z)(x-z)   (z-x)(y-x)

 

Спасибо !!!

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