如图,已知抛物线y=ax²+bx-4与x轴交于A.B两点,语y轴交于c点,经过A.B.C.三点的圆的圆心M(1,m)恰好在此抛物线的对称轴上,圆m的半径为根号十 2.点p是线段ab上的一个动点,过点p作pn∥bc,交ac于点n,
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![如图,已知抛物线y=ax²+bx-4与x轴交于A.B两点,语y轴交于c点,经过A.B.C.三点的圆的圆心M(1,m)恰好在此抛物线的对称轴上,圆m的半径为根号十 2.点p是线段ab上的一个动点,过点p作pn∥bc,交ac于点n,](/uploads/image/z/5492398-22-8.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%26%23178%3B%2Bbx-4%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8EA.B%E4%B8%A4%E7%82%B9%2C%E8%AF%ADy%E8%BD%B4%E4%BA%A4%E4%BA%8Ec%E7%82%B9%2C%E7%BB%8F%E8%BF%87A.B.C.%E4%B8%89%E7%82%B9%E7%9A%84%E5%9C%86%E7%9A%84%E5%9C%86%E5%BF%83M%281%2Cm%EF%BC%89%E6%81%B0%E5%A5%BD%E5%9C%A8%E6%AD%A4%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%8A%2C%E5%9C%86m%E7%9A%84%E5%8D%8A%E5%BE%84%E4%B8%BA%E6%A0%B9%E5%8F%B7%E5%8D%81+2.%E7%82%B9p%E6%98%AF%E7%BA%BF%E6%AE%B5ab%E4%B8%8A%E7%9A%84%E4%B8%80%E4%B8%AA%E5%8A%A8%E7%82%B9%2C%E8%BF%87%E7%82%B9p%E4%BD%9Cpn%E2%88%A5bc%2C%E4%BA%A4ac%E4%BA%8E%E7%82%B9n%2C)
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