在平面直角坐标系中,已知抛物线y=-x²+bx+c与x轴交于点A,B(点A在点B的左侧),与y轴的正半轴交与点(1)若b=2,c=3,求此时抛物线顶点的坐标(2)将(1)的抛物线向下平移,若平移后,在四边形
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![在平面直角坐标系中,已知抛物线y=-x²+bx+c与x轴交于点A,B(点A在点B的左侧),与y轴的正半轴交与点(1)若b=2,c=3,求此时抛物线顶点的坐标(2)将(1)的抛物线向下平移,若平移后,在四边形](/uploads/image/z/5910360-24-0.jpg?t=%E5%9C%A8%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-x%26sup2%3B%2Bbx%2Bc%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9A%2CB%EF%BC%88%E7%82%B9A%E5%9C%A8%E7%82%B9B%E7%9A%84%E5%B7%A6%E4%BE%A7%EF%BC%89%2C%E4%B8%8Ey%E8%BD%B4%E7%9A%84%E6%AD%A3%E5%8D%8A%E8%BD%B4%E4%BA%A4%E4%B8%8E%E7%82%B9%EF%BC%881%EF%BC%89%E8%8B%A5b%3D2%2Cc%3D3%2C%E6%B1%82%E6%AD%A4%E6%97%B6%E6%8A%9B%E7%89%A9%E7%BA%BF%E9%A1%B6%E7%82%B9%E7%9A%84%E5%9D%90%E6%A0%87%EF%BC%882%EF%BC%89%E5%B0%86%EF%BC%881%EF%BC%89%E7%9A%84%E6%8A%9B%E7%89%A9%E7%BA%BF%E5%90%91%E4%B8%8B%E5%B9%B3%E7%A7%BB%2C%E8%8B%A5%E5%B9%B3%E7%A7%BB%E5%90%8E%2C%E5%9C%A8%E5%9B%9B%E8%BE%B9%E5%BD%A2)
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