2022年中考数学压轴题精选1 .pdf
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1、1 中考数学压轴题精选精析(三)25.(08江西南昌)24如图,抛物线22121 9112 8yaxaxPyaxax经过点且与抛物线,相交于AB,两点(1)求a值;(2)设211yaxax与x轴 分 别 交 于MN,两 点(点M在 点N的 左 边),221yaxax与x轴分别交于EF,两点(点E在点F的左边),观察MNEF,四点的坐标,写出一条正确的结论,并通过计算说明;(3)设AB,两 点 的 横 坐 标 分 别 记 为ABxx,若 在x轴 上 有 一 动 点(0)Q x,且ABxxx,过Q作一条垂直于x轴的直线,与两条抛物线分别交于C,D两点,试问当x为何值时,线段CD有最大值?其最大值为
2、多少?(08 江西南昌24 题解析)24解:(1)点1 92 8P,在抛物线211yaxax上,1191428aa,2 分解得12a 3 分(2)由(1)知12a,抛物线2111122yxx,2211122yxx 5 分当2111022xx时,解得12x,21x点M在点N的左边,2Mx,1Nx 6 分当2111022xx时,解得31x,42x点E在点F的左边,1Ex,2Fx 7 分2 0MFxx,0NExx,点M与点F对称,点N与点E对称 8 分(3)102a抛物线1y开口向下,抛物线2y开口向上 9 分根据题意,得12CDyy22211111122222xxxxx 11 分ABxxx,当0
3、x时,CD有最大值2 12 分说明:第(2)问中,结论写成“MN,EF,四点横坐标的代数和为0”或“MNEF”均得 1 分26.(08江西南昌)25如图 1,正方形ABCD和正三角形EFG的边长都为 1,点EF,分别在线段ABAD,上滑动,设点G到CD的距离为x,到BC的距离为y,记HEF为(当点EF,分别与BA,重合时,记0)(1)当0时(如图 2所示),求xy,的值(结果保留根号);(2)当为何值时,点G落在对角形AC上?请说出你的理由,并求出此时xy,的值(结果保留根号);(3)请你补充完成下表(精确到0.01):0153045607590 x0.03 0 0.29 y0.29 0.13
4、 0.03(4)若将“点EF,分别在线段ABAD,上滑动”改为“点EF,分别在正方形ABCD边上滑动”当滑动一周时,请使用(3)的结果,在图4中描出部分点后,勾画出点G运动所形成的大致图形文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文
5、档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G
6、5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6
7、L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N
8、2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G
9、1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3
10、A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N23(参考数据:626231.732 sin150.259 sin 750.9
11、6644,)(08 江西南昌25 题解析)25 解:(1)过G作MNAB于M交CD于N,GKBC于K60ABG,1BG,32MG,12BM 2 分312x,12y 3 分(2)当45时,点G在对角线AC上,其理由是:4 分过G作IQBC交ABCD,于IQ,过G作JPAB交ADBC,于JP,AC平分BCD,GPGQ,GIGJGEGF,RtRtGEIGFJ,GEIGFJ60GEFGFE,AEFAFE90EAF,45AEFAFE即45时,点G落在对角线AC上 6 分(以下给出两种求xy,的解法)方法一:4560105AEG,75GEI在RtGEI中,62sin754GIGE,文档编码:CU10W7G
12、1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3
13、A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K
14、5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W
15、7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8
16、M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y
17、5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU1
18、0W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N24 6214GQIQGI 7 分6214xy 8 分方法二:当点G在对角线AC上时,有132222x,7 分解得6214x6214xy 8 分(3)0153045607590 x0.13 0.03 0 0.03 0.13 0.29 0.50 y0.50 0.29 0.13 0.03 0
19、0.03 0.13 10 分(4)由点G所得到的大致图形如图所示:12 分说明:1第(2)问回答正确的得1 分,证明正确的得2 分,求出xy,的值各得1 分;2第(3)问表格数据,每填对其中4 空得 1 分;3第(4)问图形画得大致正确的得2 分,只画出图形一部分的得1 分27.(08 山东滨州)23、(1)探究新知:如图1,已知 ABC与 ABD的面积相等,试判断AB与 CD的位置关系,并说明理由.文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R
20、8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6
21、 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文
22、档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G
23、5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6
24、L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N
25、2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G
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