【竞赛】P是⊙O外一点PA切⊙O于A,PBC是⊙O的割线AD⊥PO于D,求证:PB:BD=PC:CD |
【竞赛】P是⊙O外一点PA切⊙O于A,PBC是⊙O的割线AD⊥PO于D,求证:PB:BD=PC:CD |
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