若点P是抛物线上的动点,点Q是直线y=—x上的动点,判断有几个位置能使一点P,Q,B,O为如图,在平面直角坐标系中,已知抛物线经过A(﹣4,0),B(0,4),C(2,0)三点.(1)求抛物线解析式(2)若点M为
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![若点P是抛物线上的动点,点Q是直线y=—x上的动点,判断有几个位置能使一点P,Q,B,O为如图,在平面直角坐标系中,已知抛物线经过A(﹣4,0),B(0,4),C(2,0)三点.(1)求抛物线解析式(2)若点M为](/uploads/image/z/14768682-42-2.jpg?t=%E8%8B%A5%E7%82%B9P%E6%98%AF%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8A%E7%9A%84%E5%8A%A8%E7%82%B9%2C%E7%82%B9Q%E6%98%AF%E7%9B%B4%E7%BA%BFy%3D%E2%80%94x%E4%B8%8A%E7%9A%84%E5%8A%A8%E7%82%B9%2C%E5%88%A4%E6%96%AD%E6%9C%89%E5%87%A0%E4%B8%AA%E4%BD%8D%E7%BD%AE%E8%83%BD%E4%BD%BF%E4%B8%80%E7%82%B9P%2CQ%2CB%2CO%E4%B8%BA%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%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%BB%8F%E8%BF%87A%EF%BC%88%EF%B9%A34%2C0%EF%BC%89%2CB%EF%BC%880%2C4%EF%BC%89%2CC%EF%BC%882%2C0%EF%BC%89%E4%B8%89%E7%82%B9.%EF%BC%881%EF%BC%89%E6%B1%82%E6%8A%9B%E7%89%A9%E7%BA%BF%E8%A7%A3%E6%9E%90%E5%BC%8F%EF%BC%882%EF%BC%89%E8%8B%A5%E7%82%B9M%E4%B8%BA)
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