如图,等腰梯形ABCD内接于⊙O,弦AB‖CD,延长DC到E,EB交⊙O于F,连接DF.求证:A如图,等腰梯形ABCD内接于⊙O,弦AB‖CD,延长DC到E,EB交⊙O于F,连接DF.求证:AD·ED=BE·DF.
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![如图,等腰梯形ABCD内接于⊙O,弦AB‖CD,延长DC到E,EB交⊙O于F,连接DF.求证:A如图,等腰梯形ABCD内接于⊙O,弦AB‖CD,延长DC到E,EB交⊙O于F,连接DF.求证:AD·ED=BE·DF.](/uploads/image/z/11503142-62-2.jpg?t=%E5%A6%82%E5%9B%BE%2C%E7%AD%89%E8%85%B0%E6%A2%AF%E5%BD%A2ABCD%E5%86%85%E6%8E%A5%E4%BA%8E%E2%8A%99O%2C%E5%BC%A6AB%E2%80%96CD%2C%E5%BB%B6%E9%95%BFDC%E5%88%B0E%2CEB%E4%BA%A4%E2%8A%99O%E4%BA%8EF%2C%E8%BF%9E%E6%8E%A5DF.%E6%B1%82%E8%AF%81%3AA%E5%A6%82%E5%9B%BE%2C%E7%AD%89%E8%85%B0%E6%A2%AF%E5%BD%A2ABCD%E5%86%85%E6%8E%A5%E4%BA%8E%E2%8A%99O%2C%E5%BC%A6AB%E2%80%96CD%2C%E5%BB%B6%E9%95%BFDC%E5%88%B0E%2CEB%E4%BA%A4%E2%8A%99O%E4%BA%8EF%2C%E8%BF%9E%E6%8E%A5DF.%E6%B1%82%E8%AF%81%3AAD%C2%B7ED%3DBE%C2%B7DF.)
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