如图所示,已知点A(-1,0)B(3,O) C(O,t) 且t>0,tan∠BAC=3,抛物线经过A、B、C三点,点P(2,m)是抛物线与直线l:y=k(x+1)的一个交点(1)球抛物线的解析式(2)对于动点Q(1,n),求PQ+QB最小值(3)若动点M
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![如图所示,已知点A(-1,0)B(3,O) C(O,t) 且t>0,tan∠BAC=3,抛物线经过A、B、C三点,点P(2,m)是抛物线与直线l:y=k(x+1)的一个交点(1)球抛物线的解析式(2)对于动点Q(1,n),求PQ+QB最小值(3)若动点M](/uploads/image/z/14078408-32-8.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%B7%B2%E7%9F%A5%E7%82%B9A%28-1%2C0%EF%BC%89B%283%2CO%29+C%28O%2Ct%29+%E4%B8%94t%3E0%2Ctan%E2%88%A0BAC%3D3%2C%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%BB%8F%E8%BF%87A%E3%80%81B%E3%80%81C%E4%B8%89%E7%82%B9%2C%E7%82%B9P%EF%BC%882%2Cm%EF%BC%89%E6%98%AF%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8E%E7%9B%B4%E7%BA%BFl%3Ay%3Dk%28x%2B1%29%E7%9A%84%E4%B8%80%E4%B8%AA%E4%BA%A4%E7%82%B9%EF%BC%881%EF%BC%89%E7%90%83%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%E5%AF%B9%E4%BA%8E%E5%8A%A8%E7%82%B9Q%EF%BC%881%2Cn%EF%BC%89%2C%E6%B1%82PQ%2BQB%E6%9C%80%E5%B0%8F%E5%80%BC%EF%BC%883%EF%BC%89%E8%8B%A5%E5%8A%A8%E7%82%B9M)
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