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錐面如何倒角? |
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點評
多謝這位師傅,這才是真正讓我茅塞頓開的回答,!其實初中就學過的定理只是我早忘了,用了一晚上才搞明白B=90-A/2,,切線定理居然忘了,,哎!多謝啦,,終于又解決了我的一個疑問,,開心啊
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