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2023年高考数学二轮复习(全国版理)第1部分专题突破专题6第4讲母题突破1 范围、最值问题_2.2025数学总复习_赠品通用版(老高考)复习资料_二轮复习

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2023年高考数学二轮复习(全国版理)第1部分专题突破专题6第4讲母题突破1 范围、最值问题_2.2025数学总复习_赠品通用版(老高考)复习资料_二轮复习
2023年高考数学二轮复习(全国版理)第1部分专题突破专题6第4讲母题突破1 范围、最值问题_2.2025数学总复习_赠品通用版(老高考)复习资料_二轮复习
2023年高考数学二轮复习(全国版理)第1部分专题突破专题6第4讲母题突破1 范围、最值问题_2.2025数学总复习_赠品通用版(老高考)复习资料_二轮复习
2023年高考数学二轮复习(全国版理)第1部分专题突破专题6第4讲母题突破1 范围、最值问题_2.2025数学总复习_赠品通用版(老高考)复习资料_二轮复习
2023年高考数学二轮复习(全国版理)第1部分专题突破专题6第4讲母题突破1 范围、最值问题_2.2025数学总复习_赠品通用版(老高考)复习资料_二轮复习
2023年高考数学二轮复习(全国版理)第1部分专题突破专题6第4讲母题突破1 范围、最值问题_2.2025数学总复习_赠品通用版(老高考)复习资料_二轮复习
2023年高考数学二轮复习(全国版理)第1部分专题突破专题6第4讲母题突破1 范围、最值问题_2.2025数学总复习_赠品通用版(老高考)复习资料_二轮复习

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第 4 讲 圆锥曲线的综合问题 [考情分析] 1.圆锥曲线的综合问题是高考考查的重点内容,常见的热点题型有范围、最值 问题,定点、定值问题及探索性问题.2.以解答题的形式压轴出现,难度较大. 母题突破 1 范围、最值问题 母题 (2022·全国甲卷改编)已知抛物线C:y2=4x的焦点为F,点D(2,0),过F的直线交抛 物线C于M,N两点.设直线 MD,ND与抛物线C的另一个交点分别为 A,B,记直线 MN,AB的倾斜角分别为α,β.当α-β取得最大值时,求直线AB的方程. 思路分析 ❶点差法求k ,k AB MN ↓ ❷联立MN与抛物线方程 ↓ ❸联立AM,BN与抛物线方程 ↓ ❹k 与k 的关系 AB MN ↓ ❺构造tanα-β关于k 的函数 AB 解 当MN⊥x轴时,易得α=β=, 此时α-β=0. 当MN的斜率存在时,设M(x,y), 1 1 N(x,y),A(x,y),B(x,y), 2 2 3 3 4 4 则直线MN的方程为 y-y=(x-x), 1 1 即y-y=(x-x), 1 1 即y-y=(x-x), 1 1 即y(y+y)-y(y+y)=4(x-x), 1 2 1 1 2 1 所以直线MN的方程为 y(y+y)-yy=4x,tan α=. 1 2 1 2 同理可得,直线AM的方程为 y(y+y)-yy=4x, 3 1 3 1直线BN的方程为 y(y+y)-yy=4x, 4 2 4 2 直线AB的方程为y(y+y)-yy=4x. 4 3 4 3 因为F(1,0)在MN上,所以yy=-4. 1 2 因为D(2,0)在AM,BN上, 所以yy=-8,yy=-8, 3 1 4 2 所以y=-,y=-. 3 4 所以y+y=--=- 3 4 =-=2(y+y), 1 2 yy===-16, 3 4 所以直线AB的方程y(y+y)-yy=4x可化为(y+y)y+8=2x, 4 3 4 3 1 2 所以tan β=, 所以tan(α-β)= ==2×. 当y+y<0时,tan(α-β)<0, 2 1 所以不符合题意. 当y+y>0时,(y+y)+≥4, 2 1 2 1 tan(α-β)≤2×=, 当且仅当y+y=, 2 1 即y+y=2时取等号, 2 1 此时α-β取得最大值,直线AB的方程为x-y-4=0. 综上,当α-β取得最大值时,直线AB的方程为x-y-4=0. [子题1] (2022·许昌模拟)已知双曲线C:x2-=1,过点A(0,-1)的直线l与双曲线C的左、 右两支分别交于D,E两点,与双曲线C的两条渐近线分别交于G,H两点,求的取值范围. 解 显然直线l的斜率存在,设直线l的方程为 y=kx-1,D(x,y),E(x,y), 1 1 2 2 联立 得(2-k2)x2+2kx-3=0, 因为l与双曲线C的左、右两支分别交于D,E两点, 故 解得-0, y+y=, 1 2 y·y=, 1 2 所以S =|OA|·|y-y| △OHG 1 2 =×1× = =, 因为MN=2OM, 所以S =2S , △GHN △OHG 设四边形OHNG的面积为S, 则S=S +S =3S = △OHG △GHN △OHG ==, 令=m(m≥1),再令y=3m+, 由对勾函数性质知,y=3m+在[1,+∞)上单调递增,所以当m=1时,y =4, min 此时t=0,3+取得最小值4, 所以S =. max 规律方法 求解范围、最值问题的常见方法 (1)利用判别式来构造不等关系. (2)利用已知参数的范围,在两个参数之间建立函数关系. (3)利用隐含或已知的不等关系建立不等式. (4)利用基本不等式. 1.(2022·平凉模拟)如图,已知椭圆C:+=1,点P(2,1)为椭圆C上一点.过点P作两直线l 1 与l 分别交椭圆C于A,B两点,若直线l 与l 的斜率互为相反数,求|AB|的最大值. 2 1 2 解 设直线l 为y=k(x-2)+1, 1 则直线l 为y=-k(x-2)+1, 2 联立 整理得(2k2+1)x2+(4k-8k2)x+(8k2-8k-4)=0, 由Δ=(4k-8k2)2-4(2k2+1)(8k2-8k-4)=16(k+1)2>0,解得k≠-1, 又由x x =,可得x =,则y =k(x -2)+1=, A P A A A 同理可得x =,y =, B B 所以|AB|2=(x -x )2+(y -y )2==≤=16, A B A B 当且仅当k=±时,等号成立, 因此,|AB|的最大值为4. 2.(2022·保定模拟)已知抛物线C:x2=4y,以T(0,3)为圆心的圆交抛物线C于P,Q,M,N 四点,求四边形PQMN面积的取值范围. 解 如图,设圆T的半径为r,M(x,y),N(x,y),Q(-x,y),P(-x,y), 1 1 2 2 1 1 2 2把x2=4y代入圆T:x2+(y-3)2=r2, 整理得y2-2y+9-r2=0, 由题意知,关于y的一元二次方程有两个不等实根, 则可得20,f(t)单调递增; 在上f′(t)<0,f(t)单调递减; 所以f(t)≤f =, 又f(0)=1,f(1)=0, 故f(t)的取值范围是, 综上,S 的取值范围是. 四边形PQMN 专题强化练 1.(2022·十堰模拟)已知抛物线C :x2=y,C :x2=-y,点M(x ,y)在C 上,且不与坐标 1 2 0 0 2 原点O重合,过点M作C 的两条切线,切点分别为A,B.记直线MA,MB,MO的斜率分 1 别为k,k,k. 1 2 3 (1)当x=1时,求k+k 的值; 0 1 2 (2)当点M在C 上运动时,求+-的取值范围. 2 解 (1)因为x =1,则有y =-1,设过点M并与C 相切的直线方程为y=k(x-1)-1,联立 0 0 1 方程组 整理得x2-kx+k+1=0, 则Δ=(-k)2-4(k+1)=k2-4k-4=0, 由题可知,k,k 即为方程k2-4k-4=0的两根, 1 2 故有k+k=4. 1 2(2)因为y=-x(x≠0)可设过点M并与C 相切的直线方程为y=k(x-x)-x, 0 0 1 0 联立方程组 整理得x2-kx+kx+x=0, 0 则有Δ=k2-4xk-4x=0, 0 根据根与系数的关系可得k+k=4x, 1 2 0 kk=-4x, 1 2 又k==-x, 3 0 则有+-=- =-, 按照x>0和x<0两种情况讨论,如下, 0 0 当x>0时,+4x≥2=4, 0 0 则有+-≤-4, 当且仅当x=时,等号成立; 0 当x<0时, 0 --4x≥2=4, 0 则有+-≥4, 当且仅当x=-时,等号成立,故+-的取值范围为(-∞,-4]∪[4,+∞). 0 2.(2022·石家庄模拟)已知点E(,0),F,点A满足|AE|=|AF|,点A的轨迹为曲线C. (1)求曲线C的方程; (2)若直线l:y=kx+m与双曲线:-=1交于M,N两点,且∠MON=(O为坐标原点),求 点A到直线l距离的取值范围. 解 (1)设A(x,y),因为|AE|=|AF|, 所以 =×, 化简得x2+y2=1. (2)将直线l:y=kx+m与双曲线:-=1的方程联立,得 ⇒(4k2-9)x2+8kmx+4m2+36=0, 设M(x,y),N(x,y), 1 1 2 2 所以有 ⇒m2+9>4k2且k≠±, 所以x+x=-,xx=, 1 2 1 2 因为∠MON=, 所以OM⊥ON ⇒xx+yy=0 1 2 1 2⇒xx+(kx+m)(kx+m)=0, 1 2 1 2 化简得(k2+1)xx+km(x+x)+m2=0, 1 2 1 2 把x+x=-, 1 2 xx=代入,得 1 2 (k2+1)·+km·+m2=0, 化简,得m2=, 因为m2+9>4k2且k≠±, 所以有+9>4k2且k≠±, 解得k≠±, 圆x2+y2=1的圆心为(0,0),半径为1, 圆心(0,0)到直线l:y=kx+m的距离为 d===>1, 所以点A到直线l距离的最大值为+1,最小值为-1, 所以点A到直线l距离的取值范围为.
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  1. CONNECT:[ UseTime:0.000486s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000830s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000354s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000305s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000579s ]
  6. SELECT * FROM `set` [ RunTime:0.000232s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000730s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369008 LIMIT 1 [ RunTime:0.000876s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369008 [ RunTime:0.002330s ]
  10. UPDATE `wendang` SET `lasttime` = 1773086289 WHERE `id` = 369008 [ RunTime:0.000445s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369008 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000475s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369008 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000475s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369008 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001950s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369008 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001286s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369008 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.020116s ]
0.107722s