已知抛物线y=-x^2+(k+1)+3,当x1时,y随着x的增大而减小.(1)求k的值及抛物线的解析式(2)设抛物线与X轴交于A、B两点(A在B的左边),抛物线的顶点为P,试求出A、B、P三点的坐标,并在直角坐标系
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![已知抛物线y=-x^2+(k+1)+3,当x1时,y随着x的增大而减小.(1)求k的值及抛物线的解析式(2)设抛物线与X轴交于A、B两点(A在B的左边),抛物线的顶点为P,试求出A、B、P三点的坐标,并在直角坐标系](/uploads/image/z/5304775-31-5.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%EF%BC%9D-x%5E2%2B%28k%2B1%29%2B3%2C%E5%BD%93x1%E6%97%B6%2Cy%E9%9A%8F%E7%9D%80x%E7%9A%84%E5%A2%9E%E5%A4%A7%E8%80%8C%E5%87%8F%E5%B0%8F.%EF%BC%881%EF%BC%89%E6%B1%82k%E7%9A%84%E5%80%BC%E5%8F%8A%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%EF%BC%882%29%E8%AE%BE%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8EX%E8%BD%B4%E4%BA%A4%E4%BA%8EA%E3%80%81B%E4%B8%A4%E7%82%B9%EF%BC%88A%E5%9C%A8B%E7%9A%84%E5%B7%A6%E8%BE%B9%EF%BC%89%2C%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E9%A1%B6%E7%82%B9%E4%B8%BAP%2C%E8%AF%95%E6%B1%82%E5%87%BAA%E3%80%81B%E3%80%81P%E4%B8%89%E7%82%B9%E7%9A%84%E5%9D%90%E6%A0%87%2C%E5%B9%B6%E5%9C%A8%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB)
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