1.已知:如图,AB=BC,以AB为直径的圆心O交AC于点D,过D作DE⊥BC,垂足为E,(1)求证DE是圆心O的切线(2)作DG⊥AB交圆心O于点G,垂足为F,若角A=30°,AB=8求弦DG的长2已知抛物线y=ax^2+bx+c(a≠0)的对称轴为x
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![1.已知:如图,AB=BC,以AB为直径的圆心O交AC于点D,过D作DE⊥BC,垂足为E,(1)求证DE是圆心O的切线(2)作DG⊥AB交圆心O于点G,垂足为F,若角A=30°,AB=8求弦DG的长2已知抛物线y=ax^2+bx+c(a≠0)的对称轴为x](/uploads/image/z/5394310-70-0.jpg?t=1.%E5%B7%B2%E7%9F%A5%3A%E5%A6%82%E5%9B%BE%2CAB%3DBC%2C%E4%BB%A5AB%E4%B8%BA%E7%9B%B4%E5%BE%84%E7%9A%84%E5%9C%86%E5%BF%83O%E4%BA%A4AC%E4%BA%8E%E7%82%B9D%2C%E8%BF%87D%E4%BD%9CDE%E2%8A%A5BC%2C%E5%9E%82%E8%B6%B3%E4%B8%BAE%2C%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81DE%E6%98%AF%E5%9C%86%E5%BF%83O%E7%9A%84%E5%88%87%E7%BA%BF%EF%BC%882%EF%BC%89%E4%BD%9CDG%E2%8A%A5AB%E4%BA%A4%E5%9C%86%E5%BF%83O%E4%BA%8E%E7%82%B9G%2C%E5%9E%82%E8%B6%B3%E4%B8%BAF%2C%E8%8B%A5%E8%A7%92A%3D30%C2%B0%2CAB%3D8%E6%B1%82%E5%BC%A6DG%E7%9A%84%E9%95%BF2%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%5E2%2Bbx%2Bc%EF%BC%88a%E2%89%A00%EF%BC%89%E7%9A%84%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%BAx)
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