很好。也可直接把 a+b = -1 -c 代入第二式化简。

来源: 乱弹于 2012-09-16 08:27:53 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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很好。 也可直接把 a+b = -1 -c 代入第二式化简。