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earthen:就在LDE里。 e^j<jV`1 conic (2011-12-31 14:13) 4p.^'2m
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fumm20:但就是不知到如何設置滿足方程y2=4fx 的拋物面,急啊。各位獻個策呀 (2011-12-31 15:01) 7{e=="#*
phoenixzqy:呵呵呵,你上過高中就應當會的啊。將拋物面方程轉化成半徑r和conic的表達式,不就知道半徑是多少了? (2011-12-31 19:54) 17|np2~
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