当前位置:首页>文档>2024年高考数学一轮复习(新高考版)第8章 必刷大题17 解析几何_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

2024年高考数学一轮复习(新高考版)第8章 必刷大题17 解析几何_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

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2024年高考数学一轮复习(新高考版)第8章 必刷大题17 解析几何_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第8章 必刷大题17 解析几何_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第8章 必刷大题17 解析几何_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第8章 必刷大题17 解析几何_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

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必刷大题 17 解析几何 1.(2022·南通模拟)已知P为抛物线C:y2=4x上位于第一象限的点,F为C的焦点,PF与 C交于点Q(异于点P).直线l与C相切于点P,与x轴交于点M.过点P作l的垂线交C于另 一点N. (1)证明:线段MP的中点在定直线上; (2)若点P的坐标为(2,2),试判断M,Q,N三点是否共线. 解 (1)设P(x,y),则y=4x, 0 0 0 因为点P在第一象限, 所以y=2, 0 对y=2两边求导得y′=, 所以直线l的斜率为, 所以直线l的方程为y-2=(x-x), 0 令y=0,则x=-x, 0 所以M(-x,0), 0 所以线段MP的中点为, 所以线段MP的中点在定直线x=0上. (2)若P(2,2),则M(-2,0). 所以k =,k =2, MP PF 因为PN⊥l, 所以k =-, PN 所以直线PF:y=2(x-1), 直线PN:y=-(x-4). 由得2x2-5x+2=0, 所以x=或2, 所以Q, 由得x2-10x+16=0, 所以x=2或8, 所以N(8,-4). 因为M(-2,0),Q,N(8,-4), 所以k =-,k =-, MQ MN 所以M,Q,N三点共线. 2.(2023·石家庄模拟)已知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 =×, 将等式两边平方后化简得x2+y2=1. (2)将直线l:y=kx+m与双曲线-=1联立,得⇒(4k2-9)x2+8kmx+4m2+36=0, 设M(x,y),N(x,y), 1 1 2 2 所以有即m2+9>4k2且k≠±, 所以x+x=-,xx=, 1 2 1 2 因为∠MON=, 所以OM⊥ON,即OM·ON=0,所以xx+yy=0⇒xx+(kx+m)·(kx+m)=0, 1 2 1 2 1 2 1 2 化简得(k2+1)xx+km(x+x)+m2=0, 1 2 1 2 把x +x =-,xx =代入,得(k2+1)·+km·+m2=0,化简得 m2=,因为 m2+9>4k2且 1 2 1 2 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. 3.(2023·广州模拟)已知椭圆C:+=1(a>b>0),点F(1,0)为椭圆的右焦点,过点F且斜率不 为0的直线l 交椭圆于M,N两点,当l 与x轴垂直时,|MN|=3. 1 1 (1)求椭圆C的标准方程; (2)A ,A 分别为椭圆的左、右顶点,直线AM,AN分别与直线l :x=1交于P,Q两点, 1 2 1 2 2 证明:四边形OPA Q为菱形. 2 (1)解 由题可知c=1. 当l 与x轴垂直时,不妨设M的坐标为, 1 所以 解得a=2,b=. 所以椭圆C的标准方程为+=1. (2)证明 设l 的方程为x=my+1,M(x,y),N(x,y), 1 1 1 2 2 联立消去x得(3m2+4)y2+6my-9=0, 易知Δ>0恒成立,由根与系数的关系得y+y=,yy=, 1 2 1 2由直线AM的斜率为 =,得直线AM的方程为y=(x+2), 1 1 当x=1时,y =, P 由直线AN的斜率为 =,得直线AN的方程为y=(x-2), 2 2 当x=1时,y =, Q 若四边形OPA Q为菱形,则对角线相互垂直且平分,下面证y +y =0, 2 P Q 因为y +y =+==, P Q 则2myy-3(y+y)=2m·-3·==0, 1 2 1 2 所以|PF|=|QF|,即PQ与OA 相互垂直且平分,所以四边形OPA Q为菱形. 2 2 4.(2022·衡阳模拟)设椭圆E:+=1(a>b>0)的左顶点为A,上顶点为B.已知椭圆的离心率为, |AB|=. (1)求椭圆E的方程; (2)设P,Q为椭圆E上异于点A的两动点,若直线AP,AQ的斜率之积为-. ①证明直线PQ恒过定点,并求出该点坐标; ②求△APQ面积的最大值. (1)解 ∵e=,|AB|=, ∴a2=4c2,a2+b2=7, 又a2=b2+c2,∴a2=4,b2=3, ∴椭圆E的方程为+=1. (2)①证明 当直线PQ的斜率存在时,设直线PQ的方程为y=kx+m, 由消去y得(3+4k2)x2+8kmx+4m2-12=0, 设P(x,y),Q(x,y),则x+x=,xx=, 1 1 2 2 1 2 1 2 又A(-2,0),由题知k ·k =·=-, AP AQ 则(x+2)(x+2)+4yy=0,且x,x≠-2, 1 2 1 2 1 2 则x·x +2(x +x)+4+4(kx +m)(kx +m)=(1+4k2)xx +(2+4km)(x +x)+4m2+4=+(2+ 1 2 1 2 1 2 1 2 1 2 4km)·+4m2+4=0, 则m2-km-2k2=0, ∴(m-2k)(m+k)=0, ∴m=2k或m=-k. 当m=2k时,直线PQ的方程为y=kx+2k=k(x+2), 此时直线PQ过定点(-2,0),显然不符合题意; 当m=-k时,直线PQ的方程为 y=kx-k=k(x-1). 此时直线PQ过定点(1,0).当直线PQ的斜率不存在时, 若直线PQ过定点(1,0), P,Q的坐标分别为,. 满足k ·k =-. AP AQ 综上,直线PQ过定点(1,0). ②解 不妨设直线PQ过定点(1,0)为F. 则△APQ的面积S=×|AF|×|y-y|=|y-y|, 1 2 1 2 设直线PQ的方程为x=my+1, 联立椭圆的方程+=1, 消去x得(4+3m2)y2+6my-9=0, 则y+y=-,yy=-, 1 2 1 2 ∴S=|y-y| 1 2 = = =18. 令t=m2+1(t≥1), 则S=18=18, ∵t≥1, ∴9t++6≥16(当且仅当t=1即m=0时取等号), ∴S≤,即△APQ面积的最大值为.
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  1. CONNECT:[ UseTime:0.001137s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001529s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000810s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000799s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001439s ]
  6. SELECT * FROM `set` [ RunTime:0.000664s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001573s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369882 LIMIT 1 [ RunTime:0.001076s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369882 [ RunTime:0.005153s ]
  10. UPDATE `wendang` SET `lasttime` = 1773091179 WHERE `id` = 369882 [ RunTime:0.001206s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369882 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001305s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369882 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001223s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369882 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002220s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369882 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002233s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369882 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003719s ]
0.137624s