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1、高考调研 第1页第九章 解析几何新课标版 数学(理) 高三总复习专题专题 研究三 定值值、定点与存在性问题问题Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高考调研 第2页第九章 解析几
2、何新课标版 数学(理) 高三总复习Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高考调研 第3页第九章 解析几何新课标版 数学(理) 高三总复习Evaluation only.Evalu
3、ation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高考调研 第4页第九章 解析几何新课标版 数学(理) 高三总复习例1 (2013陕西)已知动圆过定点A(4,0),且在y轴上截得弦MN的长为8.(1)求动圆圆心的轨迹C的方程;(2)
4、已知点B( 1,0),设不垂直于x轴的直线l与轨迹C交于不同的两点P, Q,若x轴是PBQ的角平分线,证明直线l过定点题题型一 定点、定值问题值问题Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty
5、Ltd.高考调研 第5页第九章 解析几何新课标版 数学(理) 高三总复习【解析】 (1)如图,设动圆圆心O1(x,y),由题意,|O1A|O1M|.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty
6、Ltd.高考调研 第6页第九章 解析几何新课标版 数学(理) 高三总复习Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高考调研 第7页第九章 解析几何新课标版 数学(理) 高三总复习(2
7、)由题意,设直线l的方程为ykxb(k0),P(x1,y1),Q(x2,y2),Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高考调研 第8页第九章 解析几何新课标版 数学(理) 高三总
8、复习Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高考调研 第9页第九章 解析几何新课标版 数学(理) 高三总复习即y1(x21)y2(x11)0.(kx1b)(x21)(kx2b)(x
9、11)0.2kx1x2(bk)(x1x2)2b0.将 , 代入 ,得2kb2(kb)(82bk)2k2b0.kb,此时0.直线l的方程为yk(x1),即直线l过定点(1,0)【答案】 (1)y2 8x (2)恒过定点(1,0)Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose
10、Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高考调研 第10页第九章 解析几何新课标版 数学(理) 高三总复习探究1 定值、定点问题是指曲线变化或参数值变化时,某一个量不变或某一个点不变,解决的方法都是用参数把有关量表示出来,进行化简变形得出要求的定值这类问题考查的是代数运算能力Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Cli
11、ent Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高考调研 第11页第九章 解析几何新课标版 数学(理) 高三总复习(2015山东淄博期末)已知动圆C与圆C1: (x 1)2 y2 1相外切,与圆C2: (x 1)2 y2 9相内切,设动圆圆心C的轨迹为T,且轨迹T与 x轴右半轴的交点为A.(1)求轨迹T的方程;(2)已知直线l: y kx m与轨迹T相交于M, N两点(M, N不在x轴上)若以MN为直径的圆过点A,求证:直线l过定点,并求出该定点的坐标思考题1E
12、valuation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高考调研 第12页第九章 解析几何新课标版 数学(理) 高三总复习Evaluation only.Evaluation only. Creat
13、ed with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高考调研 第13页第九章 解析几何新课标版 数学(理) 高三总复习Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Cl
14、ient Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高考调研 第14页第九章 解析几何新课标版 数学(理) 高三总复习Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Asp
15、ose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高考调研 第15页第九章 解析几何新课标版 数学(理) 高三总复习Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profil
16、e 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高考调研 第16页第九章 解析几何新课标版 数学(理) 高三总复习Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高考调研 第17页第九章 解析几何新课标版 数学(