如图,抛物线y=-x^2+2x+3与x轴相交于A、B两点,与y轴交于C,顶点为D,抛物线的对称轴DF与BC相交于点E,与x轴相交于点F.(1)求线段DE的长;(2)设过E的直线与抛物线相交于M(x1,y1),N(x2,y2),试判断
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![如图,抛物线y=-x^2+2x+3与x轴相交于A、B两点,与y轴交于C,顶点为D,抛物线的对称轴DF与BC相交于点E,与x轴相交于点F.(1)求线段DE的长;(2)设过E的直线与抛物线相交于M(x1,y1),N(x2,y2),试判断](/uploads/image/z/3767828-68-8.jpg?t=%E5%A6%82%E5%9B%BE%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-x%5E2%2B2x%2B3%E4%B8%8Ex%E8%BD%B4%E7%9B%B8%E4%BA%A4%E4%BA%8EA%E3%80%81B%E4%B8%A4%E7%82%B9%2C%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%BA%8EC%2C%E9%A1%B6%E7%82%B9%E4%B8%BAD%2C%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E5%AF%B9%E7%A7%B0%E8%BD%B4DF%E4%B8%8EBC%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9E%2C%E4%B8%8Ex%E8%BD%B4%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9F.%EF%BC%881%EF%BC%89%E6%B1%82%E7%BA%BF%E6%AE%B5DE%E7%9A%84%E9%95%BF%EF%BC%9B%EF%BC%882%EF%BC%89%E8%AE%BE%E8%BF%87E%E7%9A%84%E7%9B%B4%E7%BA%BF%E4%B8%8E%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9B%B8%E4%BA%A4%E4%BA%8EM%EF%BC%88x1%2Cy1%EF%BC%89%2CN%EF%BC%88x2%2Cy2%EF%BC%89%2C%E8%AF%95%E5%88%A4%E6%96%AD)
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