在∆ABC中,証明
(b²cosA)/a+(c²cosB)/b+(a²cosC/c)=(a⁴+b⁴+c⁴)/2abc
a-maths~~~~~~~~
2007-10-11 3:11 pm
回答 (1)
2007-10-11 5:14 pm
參考: My Maths knowledge
收錄日期: 2021-04-23 20:32:36
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https://hk.answers.yahoo.com/question/index?qid=20071011000051KK00465