如图,在平面直角坐标系中,△ABC是直角三角形,∠ACB=90,AC=BC,OA=1,OC=4,抛物线y=x2+bx+c经过A,B两点,抛物线的顶点为D.(1)求b,c的值及顶点D的坐标(2) 探索:1.在直线AB下方的抛物线上存在一动点F
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![如图,在平面直角坐标系中,△ABC是直角三角形,∠ACB=90,AC=BC,OA=1,OC=4,抛物线y=x2+bx+c经过A,B两点,抛物线的顶点为D.(1)求b,c的值及顶点D的坐标(2) 探索:1.在直线AB下方的抛物线上存在一动点F](/uploads/image/z/12884445-45-5.jpg?t=%E5%A6%82%E5%9B%BE%2C%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%E2%96%B3ABC%E6%98%AF%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E2%88%A0ACB%3D90%2CAC%3DBC%2COA%3D1%2COC%3D4%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dx2%2Bbx%2Bc%E7%BB%8F%E8%BF%87A%2CB%E4%B8%A4%E7%82%B9%2C%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E9%A1%B6%E7%82%B9%E4%B8%BAD%EF%BC%8E%EF%BC%881%EF%BC%89%E6%B1%82b%2Cc%E7%9A%84%E5%80%BC%E5%8F%8A%E9%A1%B6%E7%82%B9D%E7%9A%84%E5%9D%90%E6%A0%87%EF%BC%882%EF%BC%89+%E6%8E%A2%E7%B4%A2%EF%BC%9A1.%E5%9C%A8%E7%9B%B4%E7%BA%BFAB%E4%B8%8B%E6%96%B9%E7%9A%84%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8A%E5%AD%98%E5%9C%A8%E4%B8%80%E5%8A%A8%E7%82%B9F)
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