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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(五十九) 定点、定值问题(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(五十九) 定点、定值问题(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(五十九) 定点、定值问题(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(五十九) 定点、定值问题(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(五十九) 定点、定值问题(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(五十九) 定点、定值问题(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(五十九) 定点、定值问题(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(五十九) 定点、定值问题 1.在平面直角坐标系xOy中,已知点F(-1,0),F(1,0),点M满足|MF |+|MF |=2. 1 2 1 2 记M的轨迹为C. (1)求C的方程; (2)设点P为x轴上的动点,经过F 且不垂直于坐标轴的直线l与C交于A,B两点, 1 且|PA|=|PB|,证明:为定值. 2.已知点F ,F 分别为双曲线C:-=1(a>0,b>0)的左、右焦点,点A为双曲线C 1 2 的右顶点,已知|FA|=3-,且点F 到一条渐近线的距离为2. 2 2 (1)求双曲线C的方程; (2)若直线l:y=mx+n与双曲线C交于两点M,N,直线OM,ON的斜率分别记为 k ,k ,且+=,求证直线l过定点,并求出定点坐标. OM ON 3.(2024·河北张家口模拟)已知⊙O :(x+1)2+y2=1,⊙O :(x-1)2+y2=9,⊙M与 1 2 ⊙O 外切,与⊙O 内切. 1 2 (1)求点M的轨迹方程; (2)若A,B是点M的轨迹上的两点,O为坐标原点,直线OA,OB的斜率分别为k , 1 k,直线AB的斜率存在,△AOB的面积为,证明:k·k 为定值. 2 1 2 4.(2024·河北保定模拟)已知椭圆E:+=1(a>b>0)的焦距为2c,左、右焦点分别是 F,F,其离心率为,圆F:(x+c)2+y2=1与圆F:(x-c)2+y2=9相交,两圆交点在椭圆 1 2 1 2 E上. (1)求椭圆E的方程; (2)设直线l不经过点P(0,1)且与椭圆E相交于A,B两点,若直线PA与直线PB的斜率之和为-2,证明:直线l过定点. 高分推荐题 5.(2024·安徽黄山第二次质检)已知抛物线C:y2=2px(p>0),F为焦点,若圆E:(x- 1)2+y2=16与抛物线C交于两点A,B,且|AB|=4. (1)求抛物线C的方程; (2)若点P为圆E上任意一点,且过点P可以作抛物线C的两条切线PM,PN,切点分 别为M,N.求证:|MF|·|NF|恒为定值. 解析版 1.在平面直角坐标系xOy中,已知点F(-1,0),F(1,0),点M满足|MF |+|MF |=2. 1 2 1 2 记M的轨迹为C. (1)求C的方程; (2)设点P为x轴上的动点,经过F 且不垂直于坐标轴的直线l与C交于A,B两点, 1 且|PA|=|PB|,证明:为定值.(1)解:由椭圆的定义,知M的轨迹为以F(-1,0),F(1,0)为焦点的椭圆,且2a= 1 2 2,c=1,所以b2=a2-c2=2-1=1,所以C的方程为+y2=1. (2)证明:设直线l的方程为y=k(x+1),k≠0,则联立得(1+2k2)x2+4k2x+2k2-2=0, Δ>0. 设A(x,y),B(x,y),则x+x=-,xx=,y+y=k(x+x)+2k=, 1 1 2 2 1 2 1 2 1 2 1 2 则|AB|=· =, AB的中点的坐标为, 所以AB的垂直平分线为y-=-, 令y=0,得x=-, 所以P,|FP|=1-=, 1 所以==2. 2.已知点F ,F 分别为双曲线C:-=1(a>0,b>0)的左、右焦点,点A为双曲线C 1 2 的右顶点,已知|FA|=3-,且点F 到一条渐近线的距离为2. 2 2 (1)求双曲线C的方程; (2)若直线l:y=mx+n与双曲线C交于两点M,N,直线OM,ON的斜率分别记为 k ,k ,且+=,求证直线l过定点,并求出定点坐标. OM ON (1)解:由题知,F(c,0),其中一条渐近线的方程为y=x,即bx-ay=0. 2 所以 解得a=,c=3,b=2,所以双曲线C的方程为-=1. (2)证明:设M(x,y),N(x,y),将y=mx+n代入-=1, 1 1 2 2 整理,得(5m2-4)x2+10mnx+5n2+20=0. 由Δ=100m2n2-4(5m2-4)(5n2+20)=80(n2-5m2+4)>0,得n2-5m2+4>0. 则x+x=,xx=. 1 2 1 2 因为+=+= = = = =, 所以=,得n2=4m2,即n=±2m, 所以直线l的方程为y=m(x±2). 所以当n2-5m2+4>0,且n=2m时,直线l过定点(-2,0); 当n2-5m2+4>0,且n=-2m时,直线l过定点(2,0). 3.(2024·河北张家口模拟)已知⊙O :(x+1)2+y2=1,⊙O :(x-1)2+y2=9,⊙M与 1 2 ⊙O 外切,与⊙O 内切. 1 2 (1)求点M的轨迹方程; (2)若A,B是点M的轨迹上的两点,O为坐标原点,直线OA,OB的斜率分别为k , 1 k,直线AB的斜率存在,△AOB的面积为,证明:k·k 为定值. 2 1 2 (1)解:设⊙M的半径为r,则|MO |=r+1,|MO |=3-r, 1 2|MO |+|MO |=4,故点M的轨迹与椭圆有关,2a=4,2c=2, 1 2 又由椭圆定义可知,点M的轨迹方程为+=1(x≠-2). (2)证明:设A(x ,y),B(x ,y),直线AB的方程为y=kx+t,将y=kx+t代入+= 1 1 2 2 1(x≠-2)整理得(3+4k2)x2+8ktx+4t2-12=0, 有x+x=-,xx=, 1 2 1 2 |AB|=|x-x|=·, 1 2 原点O到直线AB的距离为d=, ∴S △AOB =|AB|·d==⇒(3+4k2-2t2)2=0, 得3+4k2=2t2,即k2=,k·k== 1 2 = = =. 将k2=代入得k·k=-. 1 2 4.(2024·河北保定模拟)已知椭圆E:+=1(a>b>0)的焦距为2c,左、右焦点分别是 F,F,其离心率为,圆F:(x+c)2+y2=1与圆F:(x-c)2+y2=9相交,两圆交点在椭圆 1 2 1 2 E上. (1)求椭圆E的方程; (2)设直线l不经过点P(0,1)且与椭圆E相交于A,B两点,若直线PA与直线PB的斜率 之和为-2,证明:直线l过定点. (1)解:由题意得e==,由圆F:(x+c)2+y2=1与圆F:(x-c)2+y2=9相交,两圆交 1 2 点在椭圆E上,可知2a=1+3,又a2=b2+c2,所以a=2,b=1,c=,所以椭圆E的方程 为+y2=1. (2)证明:①当直线l的斜率不存在时,设直线l:x=t,由题意可知t≠0,且|t|<2. 设A,B, 因为直线PA,PB的斜率之和为-2, 所以+=-2,化简得t=1,所以直线l的方程为x=1. ②当直线AB的斜率存在时,设直线l:y=kx+m(m≠1),A(x,y),B(x,y), 1 1 2 2 联立消去y,化简得(4k2+1)x2+8kmx+4m2-4=0. x+x=-,xx=, 1 2 1 2 由题意可得Δ=16(4k2—m2+1)>0, 因为直线PA,PB的斜率之和为-2, 所以+=-2, 所以+=-2, 所以=-2, 所以(2k+2)·+(m-1)·=0(m≠1),化简整理得k=-m-1, 当且仅当Δ=16[4(m+1)2-m2+1]=16(3m2+8m+5)>0,即m<-或m>-1且m≠1时符 合题意, 所以直线AB的方程为y=(-m-1)x+m, 即y+1=(-m-1)(x-1),故直线l过定点(1,-1).综合①②可得,直线l过定点(1,-1). 高分推荐题 5.(2024·安徽黄山第二次质检)已知抛物线C:y2=2px(p>0),F为焦点,若圆E:(x- 1)2+y2=16与抛物线C交于两点A,B,且|AB|=4. (1)求抛物线C的方程; (2)若点P为圆E上任意一点,且过点P可以作抛物线C的两条切线PM,PN,切点分 别为M,N.求证:|MF|·|NF|恒为定值. (1)解:由题意可知E(1,0),半径r=4, 由圆的圆心以及抛物线的焦点均在坐标轴x轴上,及对称性可知AB⊥x轴于点C, 在直角三角形ACE中,|CE|===2, 因此|OC|=|OE|+|CE|=3,故A(3,2),将其代入抛物线方程中得12=6p p=2, 故抛物线方程为y2=4x. ⇒ (2)证明:令P(x,y),M(x,y),N(x,y), 0 0 1 1 2 2 抛物线在点M处的切线方程为x-x=m(y-y), 1 1 与y2=4x联立得y2-4my+4my-4x=0①, 1 1 由相切时Δ=16m2-4(4my-4x)=0得4my-4x=4m2, 1 1 1 1 代入①得y=2m, 1 故在点M处的切线方程为x-x=(y-y),即为yy=2x+2x. 1 1 1 1 同理可得点N处的切线方程为yy=2x+2x. 2 2 而两切线交于点P(x,y), 0 0 所以有yy=2x+2x,yy=2x+2x, 0 1 0 1 0 2 0 2 则直线MN的方程为2x-yy+2x=0. 0 0 由得y2-2yy+4x=0,所以y+y=2y,yy=4x, 0 0 1 2 0 1 2 0 于是|MF|·|NF|=(x+1)(x+1)=+++1=x++1=(x-1)2+y, 1 2 0 又点P(x,y)在圆E:(x-1)2+y2=16上, 0 0所以(x-1)2+y=16,即|MF|·|NF|=16. 0
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  1. CONNECT:[ UseTime:0.000876s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001741s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.008061s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000743s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001664s ]
  6. SELECT * FROM `set` [ RunTime:0.000628s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001933s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370213 LIMIT 1 [ RunTime:0.002694s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370213 [ RunTime:0.019200s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093134 WHERE `id` = 370213 [ RunTime:0.002069s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370213 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001283s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370213 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000953s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370213 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003047s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370213 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004794s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370213 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002947s ]
0.223151s