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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(五十八) 最值与范围问题(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(五十八) 最值与范围问题(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(五十八) 最值与范围问题(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(五十八) 最值与范围问题(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(五十八) 最值与范围问题(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(五十八) 最值与范围问题(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(五十八) 最值与范围问题(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(五十八) 最值与范围问题 1.(2024·江西南昌模拟)已知圆C过定点A(0,p)(p>0),圆心C在抛物线x2=2py上运 动,若MN为圆C在x轴上截得的弦,设|AM|=m,|AN|=n. (1)当点C运动时,|MN|是否变化?试证明你的结论; (2)求+的最大值. 2.(2024·辽宁抚顺模拟)已知椭圆C 的方程为+=1,双曲线C 的左、右焦点分别为 1 2 C 的左、右顶点,而C 的左、右顶点分别是C 的左、右焦点. 1 2 1 (1)求双曲线C 的方程; 2 (2)若直线l:y=kx+2与双曲线C 恒有两个不同的交点A和B,且OA·OB>1(其中O为 2 原点),求k的取值范围. 3.(2024·重庆模拟)已知焦点在y轴上的椭圆C:+=1(a>b>0),离心率为,且过点, 不过椭圆顶点的动直线l:y=kx+m与椭圆C交于A,B两点. (1)求椭圆C的标准方程; (2)求△AOB面积的最大值,并求取得最值时直线OA,OB的斜率之积. 4.已知双曲线-=1(a>0,b>0),O为坐标原点,离心率e=2,点M(,)在双曲线上. (1)求双曲线的方程; (2)如图,若直线l与双曲线的左、右两支分别交于点Q,P,且OP·OQ=0,求|OP|2+| OQ|2的最小值.高分推荐题 5.(2024·河南洛平许济第二次质量检测)已知椭圆C:+=1(a>b>0)的长轴长为4, F,F 分别为C的左、右焦点,点P(不在x轴上)在C上运动,且cos∠FPF 的最小值为. 1 2 1 2 (1)求椭圆C的标准方程; (2)过F 的直线l与椭圆C交于M,N两点,记△FMN的内切圆的半径为r,求r的取 2 1 值范围. 解析版 1.(2024·江西南昌模拟)已知圆C过定点A(0,p)(p>0),圆心C在抛物线x2=2py上运 动,若MN为圆C在x轴上截得的弦,设|AM|=m,|AN|=n. (1)当点C运动时,|MN|是否变化?试证明你的结论; (2)求+的最大值. (1)证明:设C, 则|AC|=,故圆C的方程为(x-x)2+2=x+2,令y=0,得(x-x)2+=x+-x+p2, 0 0 故(x-x)2=p2,解得x=x+p,x=x-p,故|MN|=|x-x|=2p不变化,为定值. 0 1 0 2 0 1 2 (2)解:由(1)不妨设M(x-p,0),N(x+p,0), 0 0 故m=, n=, +== == =2=2≤ 2=2, 当且仅当x=,即x=±p时取等号. 0 故+的最大值为2. 2.(2024·辽宁抚顺模拟)已知椭圆C 的方程为+=1,双曲线C 的左、右焦点分别为 1 2 C 的左、右顶点,而C 的左、右顶点分别是C 的左、右焦点. 1 2 1 (1)求双曲线C 的方程; 2 (2)若直线l:y=kx+2与双曲线C 恒有两个不同的交点A和B,且OA·OB>1(其中O为 2 原点),求k的取值范围. 解:(1)由题,在椭圆C 中,左、右焦点坐标为(-1,0)和(1,0),左、右顶点分别为(- 1 2,0)和(2,0), 因为双曲线C 的左、右焦点分别为C 的左、右顶点,而C 的左、右顶点分别是C 的 2 1 2 1 左、右焦点, 所以在双曲线C 中,设双曲线方程为-=1,则a2=1,c2=4,所以b2=c2-a2=3, 2 所以双曲线C 的方程为x2-=1. 2 (2)由(1)联立消去y并整理,得(k2-3)x2+4kx+7=0,① 消去x并整理,得(k2-3)y2+12y-12+3k2=0.② 设A(x,y),B(x,y),则x,x 为方程①的两根,y,y 为方程②的两根, 1 1 2 2 1 2 1 2 x·x=,y·y=, 1 2 1 2 OA·OB=x·x+y·y=+>1, 1 2 1 2 得k2>3或k2<1.③ 又因为方程①中,Δ=16k2-4×7(k2-3)=-12k2+84>0,得k2<7,④ 所以③④联立得k的取值范围为(-,-)∪(-1,1)∪(,). 3.(2024·重庆模拟)已知焦点在y轴上的椭圆C:+=1(a>b>0),离心率为,且过点, 不过椭圆顶点的动直线l:y=kx+m与椭圆C交于A,B两点. (1)求椭圆C的标准方程; (2)求△AOB面积的最大值,并求取得最值时直线OA,OB的斜率之积. 解:(1)因为椭圆C的离心率为, 所以可设椭圆C的方程为+=1, 因为椭圆C过点, 所以b=1,所以椭圆C的标准方程为+x2=1. (2)设A(x,y),B(x,y), 1 1 2 2 联立 得(k2+4)x2+2kmx+m2-4=0, Δ=16(k2+4-m2)>0①, x+x=,xx=, 1 2 1 2 所以|x-x|= 1 2 =·, 又点O到直线AB的距离为d=, 所以S =|AB|d △AOB =··= =2 =2≤1, 故当=,即k2+4=2m2时, △AOB的面积取最大值1,此时满足①, 所以k ·k =====-4, OA OB 所以△AOB面积的最大值为1,此时直线OA,OB的斜率之积为-4. 4.已知双曲线-=1(a>0,b>0),O为坐标原点,离心率e=2,点M(,)在双曲线上. (1)求双曲线的方程; (2)如图,若直线l与双曲线的左、右两支分别交于点Q,P,且OP·OQ=0,求|OP|2+| OQ|2的最小值. 解:(1)因为e==2, 所以c=2a,b2=c2-a2=3a2. 所以双曲线的方程为-=1, 即3x2-y2=3a2. 因为点M(,)在双曲线上, 所以15-3=3a2. 所以a2=4. 所以所求双曲线的方程为-=1. (2)设直线OP的方程为y=kx(k≠0), 则直线OQ的方程为y=-x, 由得 所以|OP|2=x2+y2=. 同理可得|OQ|2==,所以+===. 设|OP|2+|OQ|2=t, 则t·=2+2+2 ≥2+2=4, 所以t≥=24, 即|OP|2+|OQ|2≥24(当且仅当|OP|=|OQ|=2时取等号). 所以当|OP|=|OQ|=2时, |OP|2+|OQ|2取得最小值24. 高分推荐题 5.(2024·河南洛平许济第二次质量检测)已知椭圆C:+=1(a>b>0)的长轴长为4, F,F 分别为C的左、右焦点,点P(不在x轴上)在C上运动,且cos∠FPF 的最小值为. 1 2 1 2 (1)求椭圆C的标准方程; (2)过F 的直线l与椭圆C交于M,N两点,记△FMN的内切圆的半径为r,求r的取 2 1 值范围. 解:(1)由题意得a=2, 设|PF|=m,|PF|=n,则m+n=2a=4. 1 2 在△FPF 中,由余弦定理可得 1 2 cos∠FPF= 1 2 ==-1 ≥-1=-1, 当且仅当m=n时取等号,从而-1=,得=,所以b2=3, 所以椭圆C的标准方程为+=1. (2)设M(x,y),N(x,y), 1 1 2 2 由椭圆的定义可得△FMN的周长为4a=8, 1 S =(|FM|+|FN|+|NM|)r=4r,所以r=S . △F1MN 1 1 △F1MN 由题知,直线l的斜率不为0, 设l的方程为x=ty+1, 联立 整理可得(4+3t2)y2+6ty-9=0,Δ>0, 且y+y=-,yy=-. 1 2 1 2 因为S =S +S △F1MN △F1F2M △F1F2N =|FF|·|y-y| 1 2 2 1 =|FF|· 1 2 =×2× =, 所以r=S =. △F1MN 令=k,则k≥1, r==,令函数f(x)=3x+,x∈[1,+∞), 则f′(x)=3-, 当x∈[1,+∞)时,f′(x)=3->0恒成立,所以f(x)=3x+在[1,+∞)上单调递增, 则3k+≥4,所以0<≤, 即0
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  1. CONNECT:[ UseTime:0.000423s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000679s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000324s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000281s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000504s ]
  6. SELECT * FROM `set` [ RunTime:0.000204s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000583s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370220 LIMIT 1 [ RunTime:0.000425s ]
  9. UPDATE `wendang` SET `liulancishu` = 2 WHERE `id` = 370220 [ RunTime:0.005759s ]
  10. UPDATE `wendang` SET `lasttime` = 1773095038 WHERE `id` = 370220 [ RunTime:0.000507s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370220 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000481s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370220 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000621s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370220 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000939s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370220 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005221s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370220 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001554s ]
0.088442s