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earthen:就在LDE里。 5PnDN\ conic (2011-12-31 14:13) E+JqWR5
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fumm20:但就是不知到如何设置满足方程y2=4fx 的抛物面,急啊。各位献个策呀 (2011-12-31 15:01) "mvt>X
phoenixzqy:呵呵呵,你上过高中就应当会的啊。将抛物面方程转化成半径r和conic的表达式,不就知道半径是多少了? (2011-12-31 19:54) lKp"xcAD
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