已知:抛物线y=a(x-2)2+b(ab<0)的顶点为A,与x轴的交点为B,C(点B在点C的左侧).(1)直接写出抛物线对称轴方程;(2)若抛物线经过原点,且△ABC为直角三角形,求a,b的值;(3)若D为抛
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![已知:抛物线y=a(x-2)2+b(ab<0)的顶点为A,与x轴的交点为B,C(点B在点C的左侧).(1)直接写出抛物线对称轴方程;(2)若抛物线经过原点,且△ABC为直角三角形,求a,b的值;(3)若D为抛](/uploads/image/z/7649113-49-3.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%9A%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Da%EF%BC%88x-2%EF%BC%892%2Bb%EF%BC%88ab%EF%BC%9C0%EF%BC%89%E7%9A%84%E9%A1%B6%E7%82%B9%E4%B8%BAA%2C%E4%B8%8Ex%E8%BD%B4%E7%9A%84%E4%BA%A4%E7%82%B9%E4%B8%BAB%2CC%EF%BC%88%E7%82%B9B%E5%9C%A8%E7%82%B9C%E7%9A%84%E5%B7%A6%E4%BE%A7%EF%BC%89%EF%BC%8E%EF%BC%881%EF%BC%89%E7%9B%B4%E6%8E%A5%E5%86%99%E5%87%BA%E6%8A%9B%E7%89%A9%E7%BA%BF%E5%AF%B9%E7%A7%B0%E8%BD%B4%E6%96%B9%E7%A8%8B%EF%BC%9B%EF%BC%882%EF%BC%89%E8%8B%A5%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%BB%8F%E8%BF%87%E5%8E%9F%E7%82%B9%2C%E4%B8%94%E2%96%B3ABC%E4%B8%BA%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E6%B1%82a%2Cb%E7%9A%84%E5%80%BC%EF%BC%9B%EF%BC%883%EF%BC%89%E8%8B%A5D%E4%B8%BA%E6%8A%9B)
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