拜托了、初三数学题、抛物线部分的已知抛物线ax²+bx(a≠0)的顶点在直线y=-1/2-1上,且过点A(4,0).(1)求这个抛物线的解析式(2)设抛物线的顶点为P,在抛物线上是否存在一点B,使四边形OPAB
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![拜托了、初三数学题、抛物线部分的已知抛物线ax²+bx(a≠0)的顶点在直线y=-1/2-1上,且过点A(4,0).(1)求这个抛物线的解析式(2)设抛物线的顶点为P,在抛物线上是否存在一点B,使四边形OPAB](/uploads/image/z/1851959-47-9.jpg?t=%E6%8B%9C%E6%89%98%E4%BA%86%E3%80%81%E5%88%9D%E4%B8%89%E6%95%B0%E5%AD%A6%E9%A2%98%E3%80%81%E6%8A%9B%E7%89%A9%E7%BA%BF%E9%83%A8%E5%88%86%E7%9A%84%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFax%26sup2%3B%2Bbx%EF%BC%88a%E2%89%A00%EF%BC%89%E7%9A%84%E9%A1%B6%E7%82%B9%E5%9C%A8%E7%9B%B4%E7%BA%BFy%3D-1%2F2-1%E4%B8%8A%2C%E4%B8%94%E8%BF%87%E7%82%B9A%284%2C0%29.%281%29%E6%B1%82%E8%BF%99%E4%B8%AA%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%EF%BC%882%EF%BC%89%E8%AE%BE%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E9%A1%B6%E7%82%B9%E4%B8%BAP%2C%E5%9C%A8%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8A%E6%98%AF%E5%90%A6%E5%AD%98%E5%9C%A8%E4%B8%80%E7%82%B9B%2C%E4%BD%BF%E5%9B%9B%E8%BE%B9%E5%BD%A2OPAB)
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