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2014 nian gao kao shan dong shu xue li ke juan 21 ti jie fa yan jiu
Author(s): 
Pages: 56-57
Year: Issue:  4
Journal: ZHONGXUE SHUXUE ZAZHI(GAOZHONG BAN)

Abstract: 题目已知抛物线C:y2=2px( p >0)的焦点为F,A为C上异于原点的任意一点,过点A的直线l交C于另一点B,交x轴的正半轴于点D,且有| FA|=| FD|。当点A的横坐标为3时,△ADF为正三角形。
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