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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(五十五) 抛物线(一)(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第九章第9讲 抛物线(一)(课件+讲义+练习)

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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(五十五) 抛物线(一)(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第九章第9讲 抛物线(一)(课件+讲义+练习)
2025届高中数学一轮复习练习:第九章限时跟踪检测(五十五) 抛物线(一)(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第九章第9讲 抛物线(一)(课件+讲义+练习)
2025届高中数学一轮复习练习:第九章限时跟踪检测(五十五) 抛物线(一)(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第九章第9讲 抛物线(一)(课件+讲义+练习)
2025届高中数学一轮复习练习:第九章限时跟踪检测(五十五) 抛物线(一)(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第九章第9讲 抛物线(一)(课件+讲义+练习)
2025届高中数学一轮复习练习:第九章限时跟踪检测(五十五) 抛物线(一)(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第九章第9讲 抛物线(一)(课件+讲义+练习)
2025届高中数学一轮复习练习:第九章限时跟踪检测(五十五) 抛物线(一)(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第九章第9讲 抛物线(一)(课件+讲义+练习)
2025届高中数学一轮复习练习:第九章限时跟踪检测(五十五) 抛物线(一)(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第九章第9讲 抛物线(一)(课件+讲义+练习)
2025届高中数学一轮复习练习:第九章限时跟踪检测(五十五) 抛物线(一)(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第九章第9讲 抛物线(一)(课件+讲义+练习)

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限时跟踪检测(五十五) 抛物线(一) 一、单项选择题 1.(2024·山西临汾第一次适应性训练)已知抛物线C的焦点F关于其准线对称的点为 (0,-9),则C的方程为( ) A.x2=6y B.x2=12y C.x2=18y D.x2=36y 2.已知抛物线C:y2=x的焦点为F,A(x,y)是C上一点,|AF|=x,则x=( ) 0 0 0 0 A.1 B.2 C.4 D.8 3.抛物线C:x2=8y的焦点为F,在C上有一点P,|PF|=8,PF的中点M到C的准 线l的距离为( ) A.6 B.8 C.4 D.1 4.(2024·山东滨州模拟)已知抛物线y2=4x的焦点为F,准线为l,P为该抛物线上一 点,PA⊥l,A为垂足.若直线AF的斜率为-,则△PAF的面积为( ) A.2 B.4 C.8 D.8 5.(2024·湖北四地七校联考)已知抛物线C:y2=2px(p>0)的焦点为F,准线为l,点P 在抛物线C上,若|PF|=4,则以线段PF为直径的圆的方程为( ) A.x2+y2-4x-4y+2=0 B.x2+y2-2x-2y+4=0 C.x2+y2-4x-4y+4=0 D.x2+y2-2x-2y+2=0 6.(2024·湖南长沙模拟)在平面直角坐标系xOy中,抛物线C:y2=2px(p>0)的焦点为 F,M是抛物线C上的一点,若△OFM的外接圆与抛物线C的准线相切,且该圆的面积为 36π,则p=( ) A.2 B.4 C.6 D.8 7.已知点P是抛物线C:y2=4x上的动点,点P到y轴的距离为d,Q(-3,3),则d+| PQ|的最小值为( ) A.5 B.+1 C.-1 D.4 8.设F为抛物线y2=2x的焦点,A,B,C为抛物线上三点,若F为△ABC的重心, 则|FA|+|FB|+|FC|的值为( ) A.1 B.2 C.3 D.4 9.(2024·山东日照模拟)如图,PQ为经过抛物线y2=2px(p>0)的焦点F的任一弦,抛 物线的准线为l,PM垂直l于M,QN垂直l于N,PQ绕l旋转一周所得旋转面的面积为 S,以MN为直径的球的面积为S,则( ) 1 2A.S>S B.S0)的焦点为 F,焦点到准线的距离为2,Q为C上的一个动点,则( ) A.C的焦点坐标为(1,0) B.若M(3,5),则△QMF周长的最小值为11 C.若M(0,4),则|QM|的最小值为2 D.在x轴上不存在点E,使得∠QEF为钝角 三、填空题与解答题 12.已知A(2,0),B为抛物线y2=x上一点,则|AB|的最小值为________. 13.(2024·广东茂名模拟)以抛物线C:y2=4x的焦点F为圆心的圆交C于A,B两点, 交C的准线于D,E两点,已知|AB|=8,则|DE|=________. 14.已知抛物线y2=2px(p>0)的焦点为F,A是抛物线上一点,横坐标为4,且位于x 轴上方,A到抛物线准线的距离等于5,过A作AB垂直于y轴,垂足为B,OB的中点为 M. (1)求抛物线的方程; (2)若过M作MN⊥FA,垂足为N,求点N的坐标. 高分推荐题15.(2024·重庆巴蜀中学月考)设抛物线y2=4x的焦点为F,准线为l,过抛物线上一点 P作l的垂线,垂足为Q.若M(3,0),N(-1,0),PF与MQ相交于点T,且TN+TP=MT, 则△TMF的面积为________. 解析版 一、单项选择题 1.(2024·山西临汾第一次适应性训练)已知抛物线C的焦点F关于其准线对称的点为 (0,-9),则C的方程为( ) A.x2=6y B.x2=12y C.x2=18y D.x2=36y 解析:由题可知,抛物线C开口向上,设C的方程为x2=2py(p>0),则抛物线C的焦 点坐标为,准线方程为y=-,所以=-,解得p=6,所以C的方程为x2=12y.故选B. 答案:B 2.已知抛物线C:y2=x的焦点为F,A(x,y)是C上一点,|AF|=x,则x=( ) 0 0 0 0 A.1 B.2 C.4 D.8 解析:由题意知抛物线的准线方程为x=-.因为|AF|=x ,所以根据抛物线的定义可得 0 x+=|AF|=x,解得x=1.故选A. 0 0 0 答案:A 3.抛物线C:x2=8y的焦点为F,在C上有一点P,|PF|=8,PF的中点M到C的准 线l的距离为( ) A.6 B.8 C.4 D.1 解析:过P作PD⊥l于D(图略),由抛物线的定义可知|PF|=|PD|=8,设抛物线的准线 l与y轴交于点A,则|FA|=4,故PF的中点M到C的准线l的距离为(|FA|+|PD|)=6.故选 A. 答案:A 4.(2024·山东滨州模拟)已知抛物线y2=4x的焦点为F,准线为l,P为该抛物线上一 点,PA⊥l,A为垂足.若直线AF的斜率为-,则△PAF的面积为( ) A.2 B.4 C.8 D.8 解析:由题意,抛物线y2=4x的焦点为F(1,0),如图,设抛物线y2=4x的准线与x轴 的交点为D,则|DF|=2.又直线AF的斜率为-,所以∠AFD=60°,因此|AF|=2|DF|=4, ∠FAP=60°.由抛物线的定义可得|PA|=|PF|,所以△PAF是边长为4的等边三角形,所以 △PAF的面积为×4×4×sin 60°=4.故选B.答案:B 5.(2024·湖北四地七校联考)已知抛物线C:y2=2px(p>0)的焦点为F,准线为l,点P 在抛物线C上,若|PF|=4,则以线段PF为直径的圆的方程为( ) A.x2+y2-4x-4y+2=0 B.x2+y2-2x-2y+4=0 C.x2+y2-4x-4y+4=0 D.x2+y2-2x-2y+2=0 解析:因为P在抛物线C上,所以a2=2p×,得a=p,所以P,又F,所以PF⊥x轴, |PF|=p=4,则以线段PF为直径的圆的圆心坐标为(2,2),半径为2,所以所求圆的方程为 (x-2)2+(y-2)2=4,即x2+y2-4x-4y+4=0. 答案:C 6.(2024·湖南长沙模拟)在平面直角坐标系xOy中,抛物线C:y2=2px(p>0)的焦点为 F,M是抛物线C上的一点,若△OFM的外接圆与抛物线C的准线相切,且该圆的面积为 36π,则p=( ) A.2 B.4 C.6 D.8 解析:依题意得,△OFM的外接圆半径为6,△OFM的外接圆圆心应位于线段OF的 垂直平分线x=上,圆心到准线x=-的距离等于6,即有+=6,解得p=8.故选D. 答案:D 7.已知点P是抛物线C:y2=4x上的动点,点P到y轴的距离为d,Q(-3,3),则d+| PQ|的最小值为( ) A.5 B.+1 C.-1 D.4 解析:∵抛物线的准线方程为x=-1,焦点F(1,0),∴P到直线x=-1的距离等于|PF|,∴P到y轴的距离d=|PF|-1,∴d+|PQ|=|PF|+|PQ|-1.又点Q在抛物线外部,∴当 F,P,Q三点共线时,|PF|+|PQ|取得最小值|QF|.∵Q(-3,3),F(1,0),∴|QF|=5, ∴d+|PQ|的最小值为5-1=4.故选D. 答案:D 8.设F为抛物线y2=2x的焦点,A,B,C为抛物线上三点,若F为△ABC的重心, 则|FA|+|FB|+|FC|的值为( ) A.1 B.2 C.3 D.4 解析:由题意可知,点F的坐标为,又F为△ABC的重心,故=,即x +x +x =.又 A B C 由抛物线的定义可知|FA|+|FB|+|FC|=x +x +x +=+=3.故选C. A B C 答案:C 9.(2024·山东日照模拟)如图,PQ为经过抛物线y2=2px(p>0)的焦点F的任一弦,抛 物线的准线为l,PM垂直l于M,QN垂直l于N,PQ绕l旋转一周所得旋转面的面积为 S,以MN为直径的球的面积为S,则( ) 1 2 A.S>S B.S0)的焦点为 F,焦点到准线的距离为2,Q为C上的一个动点,则( ) A.C的焦点坐标为(1,0) B.若M(3,5),则△QMF周长的最小值为11 C.若M(0,4),则|QM|的最小值为2 D.在x轴上不存在点E,使得∠QEF为钝角 解析:选项A,抛物线C:x2=2py(p>0),焦点到准线的距离为p=2,则C:x2=4y, 焦点F(0,1),故A错误. 选项B,∵M(3,5),F(0,1),∴|MF|==5.设点Q到准线y=-1的距离为d,点M到准 线y=-1的距离为d′=5-(-1)=6,则△QMF的周长为|MF|+|FQ|+|QM|=5+d+|QM|≥5 +d′=5+6=11,当且仅当QM⊥x轴时等号成立,故B正确. 选项C,设Q,M(0,4), 则|QM|= = =, 当x=8时,|QM|取得最小值2,故C正确. 选项D,设E(t,0),∵Q,F(0,1), ∴EF=(-t,1),EQ=, ∴EF·EQ=(-t,1)·=-tx +t2+=2≥0, 0 ∴cos∠QEF=≥0,则∠QEF不可能为钝角,故D正确.故选BCD. 答案:BCD 三、填空题与解答题 12.已知A(2,0),B为抛物线y2=x上一点,则|AB|的最小值为________. 解析:设点B(x,y),则x=y2≥0,所以|AB|====.所以当x=时,|AB|取得最小值, 且|AB| =. min 答案: 13.(2024·广东茂名模拟)以抛物线C:y2=4x的焦点F为圆心的圆交C于A,B两点, 交C的准线于D,E两点,已知|AB|=8,则|DE|=________. 解析:由抛物线方程知=1, ∴F(1,0).不妨设点A在第一象限,如图所示,由|AB|=8,y2=4x得A(4,4), ∴圆的半径为r==5, ∴|DE|=2=2=2. 答案:2 14.已知抛物线y2=2px(p>0)的焦点为F,A是抛物线上一点,横坐标为4,且位于x 轴上方,A到抛物线准线的距离等于5,过A作AB垂直于y轴,垂足为B,OB的中点为 M. (1)求抛物线的方程; (2)若过M作MN⊥FA,垂足为N,求点N的坐标. 解:(1)抛物线y2=2px的准线为x=-, 于是4+=5,∴p=2, ∴抛物线的方程为y2=4x. (2)由(1)知,点A的坐标是(4,4). 由题意,得B(0,4),M(0,2), 又∵F(1,0),∴k =. FA ∵MN⊥FA,∴k =-, MN ∴直线FA的方程为 y=(x-1)①, 直线MN的方程为 y=-x+2②, 由①②联立,得x=,y=, ∴点N的坐标为. 高分推荐题 15.(2024·重庆巴蜀中学月考)设抛物线y2=4x的焦点为F,准线为l,过抛物线上一点 P作l的垂线,垂足为Q.若M(3,0),N(-1,0),PF与MQ相交于点T,且TN+TP=MT, 则△TMF的面积为________. 解析:由TN+TP=MT得,TM+TN=-TP. 又因为F(1,0),M(3,0),N(-1,0),所以F为MN的中点, 所以TM+TN=2TF, 所以2TF=-TP, 所以T为PF的三等分点,且|TP|=2|TF|. 又因为PQ∥MF, 所以△TMF∽△TQP,且==, 所以|QP|=2|MF|=4.由抛物线的对称性,不妨设P(x,y),且在第一象限,如图所示, 0 0 |QP|=x+=x+1=4,所以x=3. 0 0 0 因为点P(x,y)在抛物线上, 0 0 所以y=2, 0 所以根据相似关系可得y =y=, T 0 所以S =|MF|·y =. △TMF T 答案:
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  1. CONNECT:[ UseTime:0.000517s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000882s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000345s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000280s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000476s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000577s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370218 LIMIT 1 [ RunTime:0.002176s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370218 [ RunTime:0.000956s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093154 WHERE `id` = 370218 [ RunTime:0.000554s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370218 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000593s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370218 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000433s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370218 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006531s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370218 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011103s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370218 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007230s ]
0.102763s