如图 AB是圆O的直径 D在AB上 且AD:BD=1:4 CD⊥AB于D 交圆O于点C 切线CP交BA延长线于P若AD、BD是关于x的方程x^2-(4m+2)x+4m^2=0(m>0)的两根 试求CD、PC的长CD=4,PC=3分之20 //)
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![如图 AB是圆O的直径 D在AB上 且AD:BD=1:4 CD⊥AB于D 交圆O于点C 切线CP交BA延长线于P若AD、BD是关于x的方程x^2-(4m+2)x+4m^2=0(m>0)的两根 试求CD、PC的长CD=4,PC=3分之20 //)](/uploads/image/z/5181893-53-3.jpg?t=%E5%A6%82%E5%9B%BE+AB%E6%98%AF%E5%9C%86O%E7%9A%84%E7%9B%B4%E5%BE%84+D%E5%9C%A8AB%E4%B8%8A+%E4%B8%94AD%EF%BC%9ABD%3D1%EF%BC%9A4+CD%E2%8A%A5AB%E4%BA%8ED+%E4%BA%A4%E5%9C%86O%E4%BA%8E%E7%82%B9C+%E5%88%87%E7%BA%BFCP%E4%BA%A4BA%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8EP%E8%8B%A5AD%E3%80%81BD%E6%98%AF%E5%85%B3%E4%BA%8Ex%E7%9A%84%E6%96%B9%E7%A8%8Bx%5E2-%284m%2B2%29x%2B4m%5E2%3D0%28m%EF%BC%9E0%EF%BC%89%E7%9A%84%E4%B8%A4%E6%A0%B9+%E8%AF%95%E6%B1%82CD%E3%80%81PC%E7%9A%84%E9%95%BFCD%3D4%2CPC%3D3%E5%88%86%E4%B9%8B20+%2F%2F%EF%BC%89)
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