已知抛物线y=ax^2+bx+3(a不等于0)与x轴交与点A(1,0)和点B(-3,0),与y轴交与点C(0,3).E为第二象限抛物线上的一点,连接BE,CE.求四边形BOCE的最大面积.
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![已知抛物线y=ax^2+bx+3(a不等于0)与x轴交与点A(1,0)和点B(-3,0),与y轴交与点C(0,3).E为第二象限抛物线上的一点,连接BE,CE.求四边形BOCE的最大面积.](/uploads/image/z/9455055-15-5.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%5E2%2Bbx%2B3%28a%E4%B8%8D%E7%AD%89%E4%BA%8E0%EF%BC%89%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%B8%8E%E7%82%B9A%EF%BC%881%2C0%EF%BC%89%E5%92%8C%E7%82%B9B%EF%BC%88-3%2C0%EF%BC%89%2C%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%B8%8E%E7%82%B9C%EF%BC%880%2C3%EF%BC%89.E%E4%B8%BA%E7%AC%AC%E4%BA%8C%E8%B1%A1%E9%99%90%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8A%E7%9A%84%E4%B8%80%E7%82%B9%2C%E8%BF%9E%E6%8E%A5BE%2CCE.%E6%B1%82%E5%9B%9B%E8%BE%B9%E5%BD%A2BOCE%E7%9A%84%E6%9C%80%E5%A4%A7%E9%9D%A2%E7%A7%AF.)
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