当前位置:首页>文档>2025届高中数学一轮复习练习:第九章限时跟踪检测(五十七) 求值与证明问题(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习

2025届高中数学一轮复习练习:第九章限时跟踪检测(五十七) 求值与证明问题(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习

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2025届高中数学一轮复习练习:第九章限时跟踪检测(五十七) 求值与证明问题(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第九章限时跟踪检测(五十七) 求值与证明问题(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第九章限时跟踪检测(五十七) 求值与证明问题(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第九章限时跟踪检测(五十七) 求值与证明问题(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习
2025届高中数学一轮复习练习:第九章限时跟踪检测(五十七) 求值与证明问题(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习

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限时跟踪检测(五十七) 求值与证明问题 1.已知椭圆 C:+=1(a>b>0)的左、右顶点分别为 A ,A ,上顶点为 B ,且 1 2 1 B1A1·B1A2=-2,离心率为. (1)求椭圆C的标准方程; (2)过椭圆C的右焦点的直线l与椭圆C交于A,B两点,椭圆C上一点M满足OA= OM+OB,求|OM|. 2.已知双曲线C:-=1(b>a>0)的右焦点为F(c,0),从①虚轴长为2;②离心率为2; ③双曲线C的两条渐近线的夹角为60°这三个条件中选取两个作为条件,求解下面的问题. (1)求C的方程; (2)过点F的直线l与双曲线C的左、右两支分别交于A,B两点,O为坐标原点,记 △AOB,△FOB的面积分别为S,S,若=+1,求直线l的方程. 1 2 注:若选择不同的组合分别解答,按第一个解答计分. 3.(2024·陕西榆林模拟)已知直线l:x+2=0,M为平面内一动点,过M作l的垂线, 垂足为N,且OM·ON=0(O为坐标原点),动点M的轨迹记为Ω. (1)证明Ω为抛物线,并指出它的焦点坐标; (2)已知P(0,1),直线x-y+t=0(t<0)与Ω交于A,B两点,直线PA,PB与Ω的另一交 点分别是C,D,证明:AB∥CD.4.(2024·安徽安庆模拟)已知椭圆C:+=1(a>b>0)的左、右顶点分别为A,B,左焦 点为F,|AF|=-1,|BF|=+1. (1)求椭圆C的标准方程; (2)设点P为x轴上的点,经过F且不垂直于坐标轴的直线l与C交于M,N两点,且| PM|=|PN|.证明:|MN|=|AB|·|FP|. 高分推荐题 5.(2024·广东汕头模拟)在平面直角坐标系xOy中,已知圆G:x2+(y-1)2=1与抛物 线C:x2=2py(p>0)交于点M,N(异于原点O),MN恰为该圆的直径.过点E(0,2)作直线交 抛物线于A,B两点,过A,B两点分别作抛物线C的切线交于点P. (1)求证:点P的纵坐标为定值; (2)若F是抛物线C的焦点,证明:∠PFA=∠PFB. 解析版 1.已知椭圆 C:+=1(a>b>0)的左、右顶点分别为 A ,A ,上顶点为 B ,且 1 2 1 B1A1·B1A2=-2,离心率为. (1)求椭圆C的标准方程; (2)过椭圆C的右焦点的直线l与椭圆C交于A,B两点,椭圆C上一点M满足OA= OM+OB,求|OM|.解:(1)B1A1·B1A2=(-a,-b)·(a,-b)=b2-a2=-2,即a2-b2=c2=2,∴c=, 又离心率为,故a=,b=1, 所以椭圆C的标准方程为+y2=1. (2)由OA=OM+OB得BA=OM, ①当直线l为y=0时,|BA|=2,|OM| =,不符合题意,舍去. max ②设直线l:x=my+,直线OM:x=my, 设A(x,y),B(x,y),M(x ,y ), 1 1 2 2 M M 联立 消去x并整理得(m2+3)y2+2my-1=0,Δ=12(m2+1)>0, 由根与系数的关系得,y+y=-,yy=-, 1 2 1 2 |AB|=|y-y|=·=. 1 2 联立解得y2=, 得到|OM|==|y |=. M 依题意得=·=, 解得m2=, 所以|OM|==. 2.已知双曲线C:-=1(b>a>0)的右焦点为F(c,0),从①虚轴长为2;②离心率为2; ③双曲线C的两条渐近线的夹角为60°这三个条件中选取两个作为条件,求解下面的问题. (1)求C的方程; (2)过点F的直线l与双曲线C的左、右两支分别交于A,B两点,O为坐标原点,记 △AOB,△FOB的面积分别为S,S,若=+1,求直线l的方程. 1 2 注:若选择不同的组合分别解答,按第一个解答计分. 解:(1)若选择①②,可知解得 所以C的方程为x2-=1. 若选择①③,因为b>a>0,所以 解得 所以C的方程为x2-=1. 若选择②③,因为b>a>0,所以 此时无法确定a,b,c. (2)由(1)知F(2,0),由题意,知直线l的斜率不为0,所以设直线l的方程为x=ty+2.由 消去x并整理得(3t2-1)y2+12ty+9=0, 设A(x ,y),B(x ,y),|y|>|y|,则可知3t2-1≠0.又Δ>0恒成立,所以y +y =,yy 1 1 2 2 1 2 1 2 1 2 =,因为yy>0,所以t<-或t>.因为==-1=-1=+1,所以=2+. 1 2 由=,得+=,所以=4,所以t=±,满足t<-或t>.所以直线l的方程为y=x-或y= -x+. 3.(2024·陕西榆林模拟)已知直线l:x+2=0,M为平面内一动点,过M作l的垂线, 垂足为N,且OM·ON=0(O为坐标原点),动点M的轨迹记为Ω. (1)证明Ω为抛物线,并指出它的焦点坐标; (2)已知P(0,1),直线x-y+t=0(t<0)与Ω交于A,B两点,直线PA,PB与Ω的另一交点分别是C,D,证明:AB∥CD. 证明:(1)设M(x,y),则N(-2,y),OM=(x,y),ON=(-2,y).因为OM·ON=0, 所以-2x+y2=0,则Ω的方程为y2=2x. 故Ω为抛物线,且焦点坐标为. (2)设A(x,y),B(x,y),C(x,y),D(x,y), 1 1 2 2 3 3 4 4 联立得y2-2y+2t=0,则Δ=4-8t>0,y+y=2,yy=2t. 1 2 1 2 直线PA的方程为y=x+1, 联立 得(y-1)y2-yy+y=0, 1 由根与系数的关系,得yy=,所以y=,同理可得y=. 1 3 3 4 则k == CD == = ==1,得k =k =1,所以AB∥CD. CD AB 4.(2024·安徽安庆模拟)已知椭圆C:+=1(a>b>0)的左、右顶点分别为A,B,左焦 点为F,|AF|=-1,|BF|=+1. (1)求椭圆C的标准方程; (2)设点P为x轴上的点,经过F且不垂直于坐标轴的直线l与C交于M,N两点,且| PM|=|PN|.证明:|MN|=|AB|·|FP|. (1)解:设椭圆C的半焦距为c, 由|AF|=-1,|BF|=+1, 可得a-c=-1,a+c=+1, 则a=,c=1,b2=a2-c2=1, 所以椭圆C的标准方程为+y2=1. (2)证明:设MN的中点为H,连接PH, 由|PM|=|PN|,可得MN⊥HP, 故直线HP为线段MN的垂直平分线. 设直线l:x=my-1(m≠0),代入到椭圆方程x2+2y2=2, 整理得(m2+2)y2-2my-1=0, 设M(x,y),N(x,y),H(x,y),P(x 0),则y+y=,yy=, 1 1 2 2 3 3 4, 1 2 1 2 所以|MN|=|y-y| 1 2 = ==, y==,x=-1=. 3 3 因为MN⊥HP,则有直线HP的方程l :y-=-m, HP 令y=0,得x=, 4 即|FP|==, 则有|MN|==2|FP|,又|AB|=2,所以|MN|=|AB|·|FP|. 高分推荐题 5.(2024·广东汕头模拟)在平面直角坐标系xOy中,已知圆G:x2+(y-1)2=1与抛物 线C:x2=2py(p>0)交于点M,N(异于原点O),MN恰为该圆的直径.过点E(0,2)作直线交 抛物线于A,B两点,过A,B两点分别作抛物线C的切线交于点P. (1)求证:点P的纵坐标为定值; (2)若F是抛物线C的焦点,证明:∠PFA=∠PFB. 证明:(1)由对称性可知抛物线与圆的交点坐标为(1,1),(-1,1),代入抛物线方程可 得2p=1, 所以抛物线方程为x2=y. 设A(x,x),B(x,x), 1 2 所以k ==x +x ,所以直线AB的方程为y-x=(x +x)(x-x),即y=(x +x)x- AB 1 2 1 2 1 1 2 xx, 1 2 因为直线AB过点E(0,2), 所以-xx=2,所以xx=-2①. 1 2 1 2 因为y′=2x,所以直线PA的斜率为2x,直线PB的斜率为2x, 1 2 直线PA的方程为y-x=2x(x-x),即y=2xx-x,同理,直线PB的方程为y=2xx- 1 1 1 2 x. 联立两直线方程,可得P, 由①可知点P的纵坐标为定值-2. (2)cos∠PFA=, cos∠PFB=, 注意到两角都在(0,π)内,可知要证∠PFA=∠PFB,即证=(*). 又F,所以FA=,FP=, 所以FA·FP=x·-=-x-=-(4x+1), 1 又|FA|==x+, 所以=-, 同理得=-,(*)式得证,即∠PFA=∠PFB.
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  1. CONNECT:[ UseTime:0.000496s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000806s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000290s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000260s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000500s ]
  6. SELECT * FROM `set` [ RunTime:0.000230s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000513s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370209 LIMIT 1 [ RunTime:0.001696s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370209 [ RunTime:0.005216s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093114 WHERE `id` = 370209 [ RunTime:0.003135s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370209 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000565s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370209 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000370s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370209 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010306s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370209 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001923s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370209 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001826s ]
0.096479s