已知抛物线Y=-1/2x^2+bx+4的对称轴x=1,与y交与点A,与x轴负半轴交与点C,作平行四边形ABOC并将此平行四边形绕点O顺时针旋转90°,得到平行四边形A'B'OC'.(1)求抛物线的解析式和点a、c坐标
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![已知抛物线Y=-1/2x^2+bx+4的对称轴x=1,与y交与点A,与x轴负半轴交与点C,作平行四边形ABOC并将此平行四边形绕点O顺时针旋转90°,得到平行四边形A'B'OC'.(1)求抛物线的解析式和点a、c坐标](/uploads/image/z/14561858-2-8.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFY%3D-1%2F2x%5E2%2Bbx%2B4%E7%9A%84%E5%AF%B9%E7%A7%B0%E8%BD%B4x%3D1%2C%E4%B8%8Ey%E4%BA%A4%E4%B8%8E%E7%82%B9A%2C%E4%B8%8Ex%E8%BD%B4%E8%B4%9F%E5%8D%8A%E8%BD%B4%E4%BA%A4%E4%B8%8E%E7%82%B9C%2C%E4%BD%9C%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABOC%E5%B9%B6%E5%B0%86%E6%AD%A4%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%E7%BB%95%E7%82%B9O%E9%A1%BA%E6%97%B6%E9%92%88%E6%97%8B%E8%BD%AC90%C2%B0%2C%E5%BE%97%E5%88%B0%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2A%26%2339%3BB%26%2339%3BOC%26%2339%3B.%EF%BC%881%EF%BC%89%E6%B1%82%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%E5%92%8C%E7%82%B9a%E3%80%81c%E5%9D%90%E6%A0%87)
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