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高三数学抛物线复习课件.ppt


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抛物线复****执教者:曹新里?授课班级: 2212 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. § 抛物线基础知识自主学****要点梳理 F和一条定直线 L(FL),直线 L叫做抛物线的.?相等焦点准线 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. p的几何意义:焦点 F到准线 L的距离图形顶点)0( 2 2??p px y)0( 2 2???p px y)0( 2 2??p py x)0( 2 2???p py x 0( 0,0 ) Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 对称轴 y=0x=0 焦点离心率 e=1 准线方程范围开口方向向右向左向上向下??????0,2 pF???????0,2 pF??????2 ,0 pF???????2 ,0 pF 2 px??2 px?2 py??2 py? R,0??yxR,0??yxR,0??xyR,0??xy Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. y 2=-8 x的焦点坐标是() A.(2,0) B.(-2,0) C.(4,0) D.(-4,0) 解析∵y 2=-8 x,∴p=4, ∴焦点坐标为(-2,0). B 题型一 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. y=-2 x 2的准线方程是() A. x==== 解析抛物线方程为 x 2=- y,准线方程为 y= . 2 12 18 18 1 D2 1 8 1 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 题型二

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