在圆O的内接三角形ABC中,AB+AC=12,AD⊥BC,垂足为D,且AD=3,设圆O的半径为y,AB为x.…在圆O的内接三角形ABC中,AB+AC=12,AD⊥BC,垂足为D,且AD=3,设圆O的半径为y,AB为x.求(1)求y与x得函数关系式.(2)当AB长等于多
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![在圆O的内接三角形ABC中,AB+AC=12,AD⊥BC,垂足为D,且AD=3,设圆O的半径为y,AB为x.…在圆O的内接三角形ABC中,AB+AC=12,AD⊥BC,垂足为D,且AD=3,设圆O的半径为y,AB为x.求(1)求y与x得函数关系式.(2)当AB长等于多](/uploads/image/z/6707879-71-9.jpg?t=%E5%9C%A8%E5%9C%86O%E7%9A%84%E5%86%85%E6%8E%A5%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CAB%2BAC%3D12%2CAD%E2%8A%A5BC%2C%E5%9E%82%E8%B6%B3%E4%B8%BAD%2C%E4%B8%94AD%3D3%2C%E8%AE%BE%E5%9C%86O%E7%9A%84%E5%8D%8A%E5%BE%84%E4%B8%BAy%2CAB%E4%B8%BAx.%E2%80%A6%E5%9C%A8%E5%9C%86O%E7%9A%84%E5%86%85%E6%8E%A5%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CAB%2BAC%3D12%2CAD%E2%8A%A5BC%2C%E5%9E%82%E8%B6%B3%E4%B8%BAD%2C%E4%B8%94AD%3D3%2C%E8%AE%BE%E5%9C%86O%E7%9A%84%E5%8D%8A%E5%BE%84%E4%B8%BAy%2CAB%E4%B8%BAx.%E6%B1%82%281%29%E6%B1%82y%E4%B8%8Ex%E5%BE%97%E5%87%BD%E6%95%B0%E5%85%B3%E7%B3%BB%E5%BC%8F.%282%29%E5%BD%93AB%E9%95%BF%E7%AD%89%E4%BA%8E%E5%A4%9A)
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