如图,AB是⊙O的直径,AM和BN是它的两条切线,DE切⊙O于点E,交AM于D交BN于C,设AD=x,BC=y1、求证:AM平行BN2、求y关于x的关系式3、求四边形ABCD的面积S,并证明:S≥2
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![如图,AB是⊙O的直径,AM和BN是它的两条切线,DE切⊙O于点E,交AM于D交BN于C,设AD=x,BC=y1、求证:AM平行BN2、求y关于x的关系式3、求四边形ABCD的面积S,并证明:S≥2](/uploads/image/z/3898736-8-6.jpg?t=%E5%A6%82%E5%9B%BE%2CAB%E6%98%AF%E2%8A%99O%E7%9A%84%E7%9B%B4%E5%BE%84%2CAM%E5%92%8CBN%E6%98%AF%E5%AE%83%E7%9A%84%E4%B8%A4%E6%9D%A1%E5%88%87%E7%BA%BF%2CDE%E5%88%87%E2%8A%99O%E4%BA%8E%E7%82%B9E%2C%E4%BA%A4AM%E4%BA%8ED%E4%BA%A4BN%E4%BA%8EC%2C%E8%AE%BEAD%3Dx%2CBC%3Dy1%E3%80%81%E6%B1%82%E8%AF%81%EF%BC%9AAM%E5%B9%B3%E8%A1%8CBN2%E3%80%81%E6%B1%82y%E5%85%B3%E4%BA%8Ex%E7%9A%84%E5%85%B3%E7%B3%BB%E5%BC%8F3%E3%80%81%E6%B1%82%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E7%9A%84%E9%9D%A2%E7%A7%AFS%2C%E5%B9%B6%E8%AF%81%E6%98%8E%EF%BC%9AS%E2%89%A52)
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