如图,已知抛物线y=-x²+2x+1-m与x轴相交于A、B两点,与y轴相交于点C,其中点C的坐标是(0,3),顶点为点D,联结CD,抛物线的对称轴与x轴相交于点E.(1)求m的值(2)求∠CDE的度数(3)在抛物线对
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![如图,已知抛物线y=-x²+2x+1-m与x轴相交于A、B两点,与y轴相交于点C,其中点C的坐标是(0,3),顶点为点D,联结CD,抛物线的对称轴与x轴相交于点E.(1)求m的值(2)求∠CDE的度数(3)在抛物线对](/uploads/image/z/10466282-2-2.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-x%26sup2%3B%2B2x%2B1-m%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%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9C%2C%E5%85%B6%E4%B8%AD%E7%82%B9C%E7%9A%84%E5%9D%90%E6%A0%87%E6%98%AF%EF%BC%880%2C3%EF%BC%89%2C%E9%A1%B6%E7%82%B9%E4%B8%BA%E7%82%B9D%2C%E8%81%94%E7%BB%93CD%2C%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%8Ex%E8%BD%B4%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9E.%EF%BC%881%EF%BC%89%E6%B1%82m%E7%9A%84%E5%80%BC%EF%BC%882%EF%BC%89%E6%B1%82%E2%88%A0CDE%E7%9A%84%E5%BA%A6%E6%95%B0%EF%BC%883%EF%BC%89%E5%9C%A8%E6%8A%9B%E7%89%A9%E7%BA%BF%E5%AF%B9)
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