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2023年高考数学二轮复习(新高考版)第1部分专题突破专题6 培优点9 圆锥曲线与圆的综合问题_2.2025数学总复习_2023年新高考资料_二轮复习_2023年高考数学二轮复习讲义+课件(新高考版)

  • 2026-03-10 04:09:26 2026-03-10 04:09:26

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2023年高考数学二轮复习(新高考版)第1部分专题突破专题6 培优点9 圆锥曲线与圆的综合问题_2.2025数学总复习_2023年新高考资料_二轮复习_2023年高考数学二轮复习讲义+课件(新高考版)
2023年高考数学二轮复习(新高考版)第1部分专题突破专题6 培优点9 圆锥曲线与圆的综合问题_2.2025数学总复习_2023年新高考资料_二轮复习_2023年高考数学二轮复习讲义+课件(新高考版)
2023年高考数学二轮复习(新高考版)第1部分专题突破专题6 培优点9 圆锥曲线与圆的综合问题_2.2025数学总复习_2023年新高考资料_二轮复习_2023年高考数学二轮复习讲义+课件(新高考版)
2023年高考数学二轮复习(新高考版)第1部分专题突破专题6 培优点9 圆锥曲线与圆的综合问题_2.2025数学总复习_2023年新高考资料_二轮复习_2023年高考数学二轮复习讲义+课件(新高考版)
2023年高考数学二轮复习(新高考版)第1部分专题突破专题6 培优点9 圆锥曲线与圆的综合问题_2.2025数学总复习_2023年新高考资料_二轮复习_2023年高考数学二轮复习讲义+课件(新高考版)
2023年高考数学二轮复习(新高考版)第1部分专题突破专题6 培优点9 圆锥曲线与圆的综合问题_2.2025数学总复习_2023年新高考资料_二轮复习_2023年高考数学二轮复习讲义+课件(新高考版)
2023年高考数学二轮复习(新高考版)第1部分专题突破专题6 培优点9 圆锥曲线与圆的综合问题_2.2025数学总复习_2023年新高考资料_二轮复习_2023年高考数学二轮复习讲义+课件(新高考版)

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培优点 9 圆锥曲线与圆的综合问题 随着新高考不断地推进与深入,高考对解析几何的要求也随之发生很大的变化,对圆的 考查在逐渐加深,与圆相关的几何性质、最值问题、轨迹问题等都能与椭圆、双曲线及抛物 线相结合,呈现别具一格的新颖试题,题型渐渐成为高考命题的热点,是一种新的命题趋势. 考点一 圆的切线与圆锥曲线的综合问题 例1 已知椭圆+=1(a>b>0)的右焦点为F(1,0),点P在椭圆上. 2 (1)求椭圆的方程; (2)点M在圆x2+y2=b2上,且M在第一象限,过点M作圆x2+y2=b2的切线交椭圆于A,B 两点,问△AFB的周长是否为定值?若是,求出定值;若不是,说明理由. 2 解 (1)由题意得 ∴ ∴椭圆的方程为+=1. (2)是定值.由题意, 设AB的方程为y=kx+m(k<0,m>0), ∵AB与圆x2+y2=3相切, ∴=,即m2=3(1+k2), 由 整理得(3+4k2)x2+8kmx+4m2-12=0, 设A(x,y),B(x,y), 1 1 2 2 则x+x=, 1 2 xx=, 1 2 ∴|AB|=|x-x| 1 2 = = =. 又|AF|2=(x-1)2+y 2 1 =(x-1)2+3 1 =(x-4)2, 1 ∴|AF|=(4-x)=2-x, 2 1 1同理|BF|=(4-x)=2-x, 2 2 2 ∴|AF|+|BF|=4-(x+x) 2 2 1 2 =4+ ∴|AF|+|BF|+|AB|=4+-=4(定值). 2 2 规律方法 处理圆的切线与圆锥曲线综合问题,主要就是巧设直线方程,利用圆的切线性质 (圆心到直线的距离等于半径)找到直线的参数之间的关系或者转化为直线斜率的一元二次方 程,利用根与系数的关系求解. 跟踪演练1 在平面直角坐标系中,F为抛物线C:x2=2py(p>0)的焦点,D为抛物线C上第 一象限内任意一点,△FOD外接圆的圆心为Q,且圆心Q到抛物线C的准线的距离为. (1)求抛物线C的方程; (2)设点P(x ,y)(x>1)为抛物线C上第一象限内任意一点,过点P作圆x2+(y-1)2=1的两 0 0 0 条切线l,l 且与y轴分别相交于A,B两点,求△PAB面积的最小值. 1 2 解 (1)由抛物线C方程x2=2py, 已知F,准线y=-, 外接圆的圆心在直线y=上, 依题意=,即p=1,抛物线C的方程为x2=2y. (2)设过点P(x,y)的直线l的方程为y-y=k(x-x), 0 0 0 0 直线kx-y+y-kx=0与圆x2+(y-1)2=1相切,则=1, 0 0 化简得(x-1)k2-2(y-1)x·k+y-2y=0,① 0 0 0 方程的根为k,k, 1 2 则有 设直线l,l 在y轴上的截距分别为y,y, 1 2 1 2 则y=y-kx,y=y-kx, 1 0 1 0 2 0 2 0 |AB|=|y-y|=|k-k|·x 1 2 1 2 0 =x· 0 = = =, S=|AB|·x=· 0 =· = ≥×(2+2)=2. 当且仅当x-1=,即x=时,S 面积取得最小值,面积最小值为2. 0 △PAB考点二 圆锥曲线中的四点共圆综合问题 例2 (2022·重庆模拟)设动点P与定点F(,0)的距离和P到定直线l:x=的距离的比是. (1)求动点P的轨迹方程; (2)设动点P的轨迹为曲线C,不过原点O且斜率为的直线l与曲线C交于不同的A,B两点, 线段AB的中点为M,直线OM与曲线C交于C,D两点,证明:A,B,C,D四点共圆. (1)解 设P(x,y), 因为动点P与定点F(,0)的距离和P到定直线l:x=的距离的比是, 所以=, 整理化简得+y2=1. 所以动点P的轨迹方程为+y2=1. (2)证明 设直线l的方程为y=x+m(m≠0),A(x,y),B(x,y), 1 1 2 2 由方程组 得x2+2mx+2m2-2=0,① 方程①的判别式为Δ=4(2-m2), 由Δ>0,得2-m2>0, 解得-0, 则y+y=t,y·y=-2, 1 2 1 2 则|AB|=·|y-y| 1 2 = =, 且线段AB中点的纵坐标为=, 即=t·+2=+2, 所以线段AB中点为M, 因为直线CD为线段AB的垂直平分线,可设直线CD的方程为x=-y+m, 则+2=-×+m, 故m=, 联立 得2ty2+2y-t(t2+5)=0, 设C(x,y),D(x,y), 3 3 4 4 则y+y=-,y·y=-(t2+5), 3 4 3 4 故|CD|=|y-y| 3 4 = =, 线段CD中点为N, 假设A,B,C,D四点共圆,则弦AB的中垂线与弦CD的中垂线的交点必为圆心, 因为CD为线段AB的中垂线,则可知弦CD的中点N必为圆心,则|AN|=|CD|, 在Rt△AMN中,|AN|2=|AM|2+|MN|2, 所以2=|AM|2+|MN|2,则 =(t2+1)(t2+8)+2+2, 故t4+8t2-1-=0, 即==0, 解得t2=1,即t=±1, 所以存在直线l,使A,B,C,D四点共圆,且圆心为弦CD的中点N, 圆N的方程为2+2= 或2+2=.
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  1. CONNECT:[ UseTime:0.000637s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000746s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000266s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000254s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000503s ]
  6. SELECT * FROM `set` [ RunTime:0.000210s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000532s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369182 LIMIT 1 [ RunTime:0.000462s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369182 [ RunTime:0.009002s ]
  10. UPDATE `wendang` SET `lasttime` = 1773087020 WHERE `id` = 369182 [ RunTime:0.000493s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369182 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000491s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369182 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000423s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369182 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001292s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369182 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003801s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369182 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002336s ]
0.091380s