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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
26、1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N25 BDCA(2)结论应用:如图2,点 M、N在反比例函数y=)0(kxk的图象上,过点M作 MEy 轴,过点N作 NF x 轴,垂足分别为E,F.试应用(1)中得到的结论证明:MN EF.yxONMFE若中的其他条件不变,只改变点M,N的位置如图3 所示,请判断 MN与 E是否平行.yxONM(08 山东滨州23 题解析)23(1)证明:分别过点C、D作.CGABDHAB、垂足为 G、H,则090.CGADHB文档编码:CU10W7G1G5R8 HW2Z
27、8M3A6L6 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 ZF5W5
28、Y5K5N2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:CU
29、10W7G1G5R8 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 HW
30、2Z8M3A6L6 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 ZF5
31、W5Y5K5N2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:
32、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:CU10W7G1G5R8
33、HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N26 CGDHABCABD与的面积相等CG=DH四边形 CGHD 为平行四边形AB CD.(2)证明:连结MF,NE 设点 M的坐标为11(,)x y,点 N的坐标为22(,)xy,点 M,N在反比例函数0kykx的图象上,11x yk,22x yk2,MEyNFxOFx1轴,轴OE=y11221122112
34、2EFMEFNEFMEFNSx ykSx ykSS由(1)中的结论可知:MN EF。MN EF。28.(08 山东滨州)24(本题满分12 分)如图(1),已知在ABC中,AB=AC=10,AD为底边 BC上的高,且AD=6。将ACD沿箭头所示的方向平移,得到/A CD。如图(2),/A D交 AB于 E,/A C分别交 AB、AD于G、F。以/D D为直径作O,设/BD的长为 x,O的面积为y。(1)求 y 与 x 之间的函数关系式及自变量x 的取值范围;(2)连结 EF,求 EF与O相切时 x 的值;文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码
35、: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:CU10W7G1G5R8
36、 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
37、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文档
38、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:CU10W7G1G5
39、R8 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 HW2Z8M3A6L
40、6 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
41、文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N2文档编码:CU10W7G1G5R8 HW2Z8M3A6L6 ZF5W5Y5K5N27(3)设四边形/ED DF的面积为S,试求 S关于 x 的函数表达式,并求x 为何值时,S的值最大,最大值是多少?(08 山东滨州24 题解析)240/22(1)10,6,908882808.4ABADADBBDCDDDBDBDxxyyxx/0/2,90,68343842165165BD ECDFEDDFEDDFFDDBBBEDBADEDBDEDxA
42、DBDEDxxxxx/0四边形EDDF 是矩形EF DD1若DF 与O 相切,则 ED=D D2EDB=AOB=90即解得因此,当时,EF 与O 相切。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 H
43、W2Z8M3A6L6 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 ZF
44、5W5Y5K5N2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
45、: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:CU10W7G1G5R8
46、 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
47、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文档
48、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 ZF5W5Y5K5N28/223384364341244812SEDD Dxxxxxxx时,满足 0,S的值最大,最大值是。29.(0
49、8 山东德州东营菏泽)24(本题满分12 分)在ABC 中,A90,AB 4,AC3,M 是 AB 上的动点(不与A,B 重合),过M 点作 MNBC 交 AC 于点 N以 MN 为直径作 O,并在 O 内作内接矩形AMPN令AMx(1)用含 x 的代数式表示 NP 的面积 S;(2)当 x 为何值时,O 与直线 BC 相切?(3)在动点M 的运动过程中,记NP 与梯形 BCNM 重合的面积为y,试求 y 关于 x的函数表达式,并求x 为何值时,y 的值最大,最大值是多少?(08 山东德州东营菏泽23 题解析)23(本题满分12 分)解:(1)MNBC,AMN=B,ANM C AMN ABCA
50、MANABAC,即43xAN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