已知,如图抛物线y=ax^2+3ax+c(a>0)与y轴交于C点,与x轴交于A,B两点,A点在B点左侧.点B坐标为(1,0),OC=30B问:点D是线段AC下方抛物线上的动点,求四边形ABCD面积的最大值.图在:http://hiphotos.baidu.com/%D0%
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![已知,如图抛物线y=ax^2+3ax+c(a>0)与y轴交于C点,与x轴交于A,B两点,A点在B点左侧.点B坐标为(1,0),OC=30B问:点D是线段AC下方抛物线上的动点,求四边形ABCD面积的最大值.图在:http://hiphotos.baidu.com/%D0%](/uploads/image/z/6973832-56-2.jpg?t=%E5%B7%B2%E7%9F%A5%2C%E5%A6%82%E5%9B%BE%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%5E2%2B3ax%2Bc%28a%EF%BC%9E0%EF%BC%89%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%BA%8EC%E7%82%B9%2C%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8EA%2CB%E4%B8%A4%E7%82%B9%2CA%E7%82%B9%E5%9C%A8B%E7%82%B9%E5%B7%A6%E4%BE%A7.%E7%82%B9B%E5%9D%90%E6%A0%87%E4%B8%BA%281%2C0%29%2COC%3D30B%E9%97%AE%EF%BC%9A%E7%82%B9D%E6%98%AF%E7%BA%BF%E6%AE%B5AC%E4%B8%8B%E6%96%B9%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8A%E7%9A%84%E5%8A%A8%E7%82%B9%2C%E6%B1%82%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E9%9D%A2%E7%A7%AF%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC.%E5%9B%BE%E5%9C%A8%EF%BC%9Ahttp%3A%2F%2Fhiphotos.baidu.com%2F%25D0%25)
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