通分:a/(a-b)( b-c),b/(b-a) (c-b)

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通分:a/(a-b)(b-c),b/(b-a)(c-b)通分:a/(a-b)(b-c),b/(b-a)(c-b)通分:a/(a-b)(b-c),b/(b-a)(c-b)∵(b-a)=-(a-b)(c-

通分:a/(a-b)( b-c),b/(b-a) (c-b)
通分:a/(a-b)( b-c),b/(b-a) (c-b)

通分:a/(a-b)( b-c),b/(b-a) (c-b)
∵(b-a) =-(a-b)
(c-b)=-(b-c)
∴负负得正,即b/(b-a) (c-b)=b/(a-b) (b-c)