如图,四边形ADBC内接于圆O,∠ADB=120°,CD平分∠ADB.
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![如图,四边形ADBC内接于圆O,∠ADB=120°,CD平分∠ADB.](/uploads/image/z/13229707-67-7.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2ADBC%E5%86%85%E6%8E%A5%E4%BA%8E%E5%9C%86O%2C%E2%88%A0ADB%3D120%C2%B0%2CCD%E5%B9%B3%E5%88%86%E2%88%A0ADB.)
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