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如图K-15-9,已知圆内接四边形ABDC,AB是⊙O的直径,OD⊥BC于点E.(1)请写出四个不同类型的正确结论;(2)若BE=4,AC=6,求DE的长.
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教案备课库《课时作业(十五)[27.1 3.圆周角]》真题及答案
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