已知三角形ABC中,∠C=90°,∠A=30°,BD平分∠CBA,且交AC于点D,AC=1,求AD的长用直角三角形的性质(二),
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![已知三角形ABC中,∠C=90°,∠A=30°,BD平分∠CBA,且交AC于点D,AC=1,求AD的长用直角三角形的性质(二),](/uploads/image/z/3050945-17-5.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E2%88%A0C%3D90%C2%B0%2C%E2%88%A0A%3D30%C2%B0%2CBD%E5%B9%B3%E5%88%86%E2%88%A0CBA%2C%E4%B8%94%E4%BA%A4AC%E4%BA%8E%E7%82%B9D%2CAC%3D1%2C%E6%B1%82AD%E7%9A%84%E9%95%BF%E7%94%A8%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9A%84%E6%80%A7%E8%B4%A8%EF%BC%88%E4%BA%8C%EF%BC%89%2C)
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