FAFBFCA.的知识精选

 设为抛物线的焦点,为该抛物线上三点,若,则|FA|+|FB|+|FC|=A.9               ...
问题详情: 设为抛物线的焦点,为该抛物线上三点,若,则|FA|+|FB|+|FC|=A.9                   B.6          C.   4           D. 3【回答】B知识点:平面向量题型:选择题...
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