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从点线距离公式那里来推斜率的,我的解析几何很烂,尤其怕斜率这东西

Posted by frkstyc at 2005-06-05 11:08:31 on Problem 1191
In Reply To:好像就是用斜率相加减的那个式子然后化简来的? Posted by:ArXoR at 2005-06-05 11:06:39


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