如图,在圆O中,∠ACB=∠BDC=60°,AC=2被的根号3cm连接AD,求证DB=DA+DC
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![如图,在圆O中,∠ACB=∠BDC=60°,AC=2被的根号3cm连接AD,求证DB=DA+DC](/uploads/image/z/6129388-28-8.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%9C%86O%E4%B8%AD%2C%E2%88%A0ACB%3D%E2%88%A0BDC%3D60%C2%B0%2CAC%3D2%E8%A2%AB%E7%9A%84%E6%A0%B9%E5%8F%B73cm%E8%BF%9E%E6%8E%A5AD%2C%E6%B1%82%E8%AF%81DB%3DDA%2BDC)
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