作业帮x-y/(z-x)(z-y) 一y-z/(x-y)(x-z) ＋z-x/(y-z)(y-x)
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x-y/(z-x)(z-y) 一y-z/(x-y)(x-z) ＋z-x/(y-z)(y-x)
x-y/(z-x)(z-y) 一y-z/(x-y)(x-z) ＋z-x/(y-z)(y-x)
x-y/(z-x)(z-y) 一y-z/(x-y)(x-z) ＋z-x/(y-z)(y-x)
原式= x-y/(z-x)(z-y)一y-z/(y-x)(z-x)一z-x/(z-y)(y-x) （这一步是把分母上的符号统一,便于同分）
= (x-y)(y-x)—(y-z)(z-y)—(z-x)(z-x) (分子)
———————————————— （分数线,这样你看的时候方便点）
(z-x)(z-y)(y-x)
-x^2+2xy-y^2+y^2-2yz+z^2-z^2+2xz-x^2 （x^2就是x的平方）
= ——————————————————
(z-x)(z-y)(y-x)
2xy-2yz+2xz-2x^2 (化简)
= ——————————————————
(z-x)(z-y)(y-x)
2x(y-x)-2z(y-x)
= ——————————————————
(z-x)(z-y)(y-x)
2(y-x)(x-z)
= ——————————————————
(z-x)(z-y)(y-x)
2 2
= ———— = ————
-（z-y） y-z
额……笔记本码字好麻烦~.
x-y/(z-x)(z-y) 一y-z/(x-y)(x-z) ＋z-x/(y-z)(y-x)
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