2022年中考专题复习训练压轴题 .pdf
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1、中考专题复习训练压轴题【预测题】1、已知,在平行四边形OABC 中,OA=5,AB=4,OCA=90 ,动点 P 从 O点出发沿射线OA 方向以每秒2 个单位的速度移动,同时动点 Q 从 A 点出发沿射线AB 方向以每秒1个单位的速度移动设移动的时间为t 秒(1)求直线AC 的解析式;(2)试求出当t 为何值时,OAC 与 PAQ 相似;(3)若 P 的半径为58,Q 的半径为23;当 P 与对角线 AC 相切时,判断Q 与直线AC、BC 的位置关系,并求出Q 点坐标。解:(1)42033yx(2)当 0t 2.5 时,P在 OA上,若 OAQ=90 时,故此时 OAC与 PAQ不可能相似当
2、t2.5时,若 APQ=90,则APQ OCA,t2.5,符合条件若 AQP=90,则APQ OAC,t2.5,符合条件综上可知,当时,OAC与 APQ相似(3)Q与直线 AC、BC均相切,Q点坐标为(109,531)。【预测题】2、如图,以矩形OABC 的顶点 O 为原点,OA 所在的直线为x 轴,OC 所在的直线为 y 轴,建立平面直角坐标系已知OA3,OC2,点 E 是 AB 的中点,在OA 上取一点 D,将 BDA 沿 BD 翻折,使点A 落在 BC 边上的点F 处(1)直接写出点E、F 的坐标;(2)设顶点为F 的抛物线交y 轴正半轴于点 P,且以点E、F、P 为顶点的三角形是等腰三
3、角形,求该抛物线的解析式;(3)在 x 轴、y 轴上是否分别存在点M、N,使得四边形MNFE 的周长最小?如果存在,求出周长的最小值;如果不存在,请说明理由解:(1)(31)E,;(12)F,(2)在RtEBF中,90Bo,2222125EFEBBF设点P的坐标为(0)n,其中0n,Q顶点(12)F,设抛物线解析式为2(1)2(0)ya xa如图,当EFPF时,22EFPF,221(2)5n解得10n(舍去);24n(0 4)P,24(01)2a解得2a抛物线的解析式为22(1)2yx如图,当EPFP时,22EPFP,22(2)1(1)9nn解得52n(舍去)(第 2 题)文档编码:CV5N1
4、S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N
5、7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8
6、E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5
7、N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C
8、8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6
9、A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:C
10、V5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4文档编码:CV5N1S5H6X8 HF1C8N7F4R4 ZS8C6A8E10J4当EFEP时,53EP,这种情况不存在综上所述,符合条件的抛物线解析式是22(1)2yx(3)存在点MN,使得四边形MNFE的周长最小如图,作点E关于x轴的对称点E,作点F关于y轴的对称点F,连接E F,分别与x轴、y轴交于点MN,则点MN,就是所求点(31)E,(1 2)FNFNF
11、MEME,43BFBE,FNNMMEF NNMMEF E22345 又5EFQ,55FNNMMEEF,此时四边形MNFE的周长最小值是55【预测题】3、如图,在边长为2 的等边 ABC 中,ADBC,点 P 为边 AB 上一个动点,过 P 点作 PF/AC 交线段 BD 于点 F,作 PGAB交 AD于点 E,交线段 CD于点 G,设 BP=x.(1)试判断BG 与 2BP 的大小关系,并说明理由;用 x 的代数式表示线段DG 的长,并写出自变量x 的取值范围;(2)记 DEF的面积为S,求 S 与 x 之间的函数关系式,并求出 S 的最大值;(3)以 P、E、F 为顶点的三角形与EDG 是否
12、可能相似?如果能相似,请求出BP 的长,如果不能,请说明理由。解:(1)在等边三角形中,60,30,2,为等边三角形,x.GEFDCABP第 3 题文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3
13、X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X
14、1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:C
15、C3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 H
16、J3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR
17、9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码
18、:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9又 2x,1,2x1,2x1,112x?.(2)S=12DEDF=1321 123xx=2333326xx当34x时
19、,348maxS.(3)如图,若t,则两三角形相似,此时可得即121xx-=-解得:23x=如图,若t,则两三角形相似,此时可得1214,即114xx-=解得:45x=【预测题】4、如图,二次函数cbxxy241的图像经过点4,4,0,4BA,且与y轴交于点C.(1)试求此二次函数的解析式;(2)试证明:CAOBAO(其中O是原点);(3)若P是线段AB上的一个动点(不与A、B重合),过P作y轴的平行线,分别交此二次函数图像及x轴于Q、H两点,试问:是否存在这样的点P,使QHPH2?若存在,请求出点P的坐标;若不存在,请说明理由。GEFDCABPGEF DCABP文档编码:CC3S10D1M3
20、N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J
21、2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9
22、文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1
23、M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G
24、5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5
25、L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10D1M3N9 HJ3X6Y3G5J2 ZR9X1M7N5L9文档编码:CC3S10
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