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[閒聊] 數學高手入黎.快

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數學高手入黎.快

In triangle ABC, there is an interior point D such that angle DBC=30 degrees, angle DCB=40 degrees, and angle BAD=angleDAC=x. If AD=BC, find x.


呢條點樣搵x..
係其他地方見到但唔明點搵..
有無高手指點

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有無人識計啊

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呢層真係唔知...
版主哥教一教ok?

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