江门市有哪些旅行社:一道题目 帮帮忙

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2xy/(x-y)(x-z)+2yz/(x-y)(z-x)

2xy/(x-y)(x-z)+2yz/(x-y)(z-x)
= 2xy/(x-y)(x-z)-2yz/(x-y)(x-z)
= 2y(x-z)/(x-y)(x-z)
= 2y/(x-y)

2xy/(x-y)(x-z)+2yz/(x-y)(z-x)=2y/(x-y)

2xy/(x-y)(x-z)+2yz/(x-y)(z-x)
= 2xy/(x-y)(x-z)-2yz/(x-y)(x-z)
= 2y(x-z)/(x-y)(x-z)
= 2y/(x-y)

2xy/(x-y)(x-z)+2yz/(x-y)(z-x)
= 2xy/(x-y)(x-z)-2yz/(x-y)(x-z)
= 2y(x-z)/(x-y)(x-z)
= 2y/(x-y)

2xy/(x-y)(x-z)+2yz/(x-y)(z-x)
= 2xy/(x-y)(x-z)-2yz/(x-y)(x-z)
= 2y(x-z)/(x-y)(x-z)
= 2y/(x-y)
2xy/(x-y)(x-z)+2yz/(x-y)(z-x)=2y/(x-y)
2xy/(x-y)(x-z)+2yz/(x-y)(z-x)
= 2xy/(x-y)(x-z)-2yz/(x-y)(x-z)
= 2y(x-z)/(x-y)(x-z)
= 2y/(x-y)

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