已知二次函数y=x²-2x-1的图像的顶点为A二次函数y=ax²+bx的图像与x轴交于原点O及另一点C,它的顶点B在函数y=x²-2x-1的图像的对称轴上.(1)求点A与点C的坐标.(2)当四边形OACB为菱形时,
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![已知二次函数y=x²-2x-1的图像的顶点为A二次函数y=ax²+bx的图像与x轴交于原点O及另一点C,它的顶点B在函数y=x²-2x-1的图像的对称轴上.(1)求点A与点C的坐标.(2)当四边形OACB为菱形时,](/uploads/image/z/1731129-33-9.jpg?t=%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dx%26sup2%3B-2x-1%E7%9A%84%E5%9B%BE%E5%83%8F%E7%9A%84%E9%A1%B6%E7%82%B9%E4%B8%BAA%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dax%26sup2%3B%2Bbx%E7%9A%84%E5%9B%BE%E5%83%8F%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E5%8E%9F%E7%82%B9O%E5%8F%8A%E5%8F%A6%E4%B8%80%E7%82%B9C%2C%E5%AE%83%E7%9A%84%E9%A1%B6%E7%82%B9B%E5%9C%A8%E5%87%BD%E6%95%B0y%3Dx%26sup2%3B-2x-1%E7%9A%84%E5%9B%BE%E5%83%8F%E7%9A%84%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%8A.%EF%BC%881%EF%BC%89%E6%B1%82%E7%82%B9A%E4%B8%8E%E7%82%B9C%E7%9A%84%E5%9D%90%E6%A0%87.%EF%BC%882%EF%BC%89%E5%BD%93%E5%9B%9B%E8%BE%B9%E5%BD%A2OACB%E4%B8%BA%E8%8F%B1%E5%BD%A2%E6%97%B6%2C)
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