[第八章第七节抛物线1.ppt

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2017-01-09 发布于北京
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[第八章第七节抛物线1.ppt

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[第八章第七节抛物线1

[答案]　 C Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 答案： B 解析：∵点P(2，y)在抛物线y2＝4x上，∴点P到焦点F的距离等于点P到准线x＝－1的距离．∵点P到准线x＝－1的距离为3，∴点P到焦点F的距离为3. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. [冲关锦囊] 研究抛物线的几何性质时，一是注意定义转化应用；二是要结合图形分析，同时注意平面几何性质的应用. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. [巧练模拟]—————(课堂突破保分题，分分必保！) 5．(2012·郑州模拟)已知倾斜角为60°的直线l通过抛物线 x2＝4y的焦点F，且抛物线相交于A，B两点，则弦AB的长为 (　　) A．14 B．6 C．10 D．16 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 返回第八章　平面解析几何第七节抛物线抓基础明考向提能力教你一招我来演练 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. [备考方向要明了] 考什么理解抛物线的定义、几何图形和标准方程知道它的简单几何性质． Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 怎么考 1.抛物线的方程、几何性质或与抛物线相关的综合问题是命题的热点． 2.题型既有小巧灵活选择、填空题，又有综合性较强的解答题. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspo