2012年全国各地市中考数学模拟试题分类汇编28直角三角形与勾股定理.pdf

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1、（第 1题图）直角三角形与勾股定理一、选择题1、（20XX 年浙江丽水一模）如图，一块含30角的直角三角板，它的斜边 AB=8cm，里面空心 DEF的各边与 ABC的对应边平行，且各对应边的距离都是1cm，那么 DEF的周长是（）A.5cm B.6cm C.cm)36(D.cm)33(答案：B 2、（20XX 年浙江金华五模）如图，在RtABC 中，AB=CB，BOAC于点 O，把 ABC 折叠，使AB 落在 AC 上，点 B 与 AC 上的点 E 重合，展开后，折痕AD 交 BO 于点 F，连结 DE、EF.下列结论：tanADB=2；图中有4 对全等三角形；若将 DEF 沿 EF 折叠，则

2、点D 不一定落在AC 上；BD=BF；S四边形DFOE=SAOF，上述结论中错误的个数是（）A1 个B2 个C3 个D4 个答案：B 3、如图，等腰RtABC（ACB 90o）的直角边与正方形DEFG 的边长均为 2，且 AC 与DE在同一直线上，开始时点 C与点 D重合，让 ABC 沿这条直线向右平移，直到点 A与点 E重合为止设 CD 的长为x，ABC 与正方形DEFG 重合部分（图中阴影部分）的面积为y，则y与x之间的函数关系的图象大致是（）答案：A 4、已知：如图，Rt ABC外切于 O，切点分别为E、F、H，ABC=90 o,直线 FE、CB交于 D点，连结AO、HE,则下列结论：F

3、EH=45 o+FAO BD=AF AB2=AODF AECH=SABC 其中正确的是().A B C D E F O(第 2 题图)A BC D答案：A 5、（2012 昆山一模）一个直角三角形的两边长分别为4 与 5，则第三边长为（）A3 B41C41与 3 D不确定答案：C 6(20XX 年南岗初中升学调研）如图，在RtABC中，AB=AC，A=90，BD是角平分线，DE BC，垂足为点 E若 CD=52，则 AD的长是()A 522B22 C 52 D5 答案：D7、（20XX 年中考数学新编及改编题试卷）如图，在RtABC中，C=90，AB=10，若以点C为圆心，CB长为半径的圆恰好

4、经过AB的中点D，则AC的长等于（）（A）5 3（B）5（C）5 2（D）6 答案：A 二、填空题1、如果一斜坡的坡度为i=13，某物体沿斜面向上推进了10 米，那么物体升高了米答案：5 2（20XX年江苏通州兴仁中学一模）如图，在RtABC 中，C=90，BC=6cm，AC=8cm，按图中所示方法将BCD 沿 BD 折叠，使点C落在 AB 边的 C点，那么ADC的面积是 _答案：6 2.3、（20XX年北京市顺义区一诊考试）如图，用测角仪测得校园的旗杆第 1题图B C D A（第 1 题）文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2

5、J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8

6、 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P1

7、0D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B

8、6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10

9、C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8

10、R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码

11、:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2顶点 A 的仰角45，仪器高1.4CD米，测角仪底部中心位置D 到旗杆根部B 的距离10BD米，则旗杆AB的高是米答案：11.4 4、(徐州市 20XX年模拟)如图，RtABC中，B90，AB 3cm，AC 5cm，将 ABC折叠，使点 C与 A重合，得折痕DE，则 AB

12、E的周长等于 _cm.答案：7 5.（盐城地区2011 2012 学年度适应性训练）如图，ABC中，AB=AC=13，BC=10，D为BC中点，DEAB于E，则DE=.答案 60/13 三、解答题1、如图，斜坡 AC 的坡度（坡比）为 1:3，AC10 米坡顶有一旗杆 BC，旗杆顶端 B 点与 A 点有一条彩带 AB 相连，AB14 米试求旗杆 BC 的高度2、（8 分）如图，在电线杆上的C处引拉线CE、CF固定电线杆，拉线CE和地面成60角.在离电线杆6 米的 B处安置测角仪，在 A处测得电线杆上C处的仰角为 30，已知测角仪高AB为 1.5 米，求拉线CE的长(结果保留根号).A B C（

13、图）D FEDCBA6米1.5米6030EDCBA文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10

14、D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6

15、 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C

16、3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R

17、2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:

18、CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J

19、5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2答案：343、当太阳光线与地面成45o角时，在坡度为i=1:2 的斜坡上的一棵树AB落在坡面上的影子AC长为 5 米，

20、落在水平线上的影子CD长为 3 米，求这棵树的高度(参考数据24.25，73.13，41.12，结果保留两个有效数字答案：5.2 4、一条船上午8 点在 A 处望见西南方向有一座灯塔B(如图)，此时测得船和灯塔相距602海里，船以每小时30 海里的速度向南偏西24o的方向航行到 C 处，这时望见灯塔在船的正北方向(参考数据：sin24o0.4，cos24o0.9)(1)求几点钟船到达C 处；(2)求船到达 C 处时与灯塔之间的距离答案：(1)AC=150 15030=5 小时(2)BC=150 cos24o-60=75 海里5、(2012 山东省德州四模)已知三角形的三边长,求三角形面积,有公

21、式：)()(cpbpapps（其 中a、b、c为三 角形的三边长，s为面积,其 中2cbap）.若已知三角形的三边长分别为2、3、4，试运用公式，计算该三角形的面积s；现在我们不用以上的公式计算，而运用初中学过的数学知识计算，你能做到吗？请试试.：如图，ABC 中 AB=7，AC=5，BC=8，求 ABC的面积。（提示：作高AD，设CDx）答案：解：（1）当 a=2，b=3，c=4 时922abcp)()(cpbpapps=9 9993(2)(3)(4)152 2224（3 分）(2)作高 AD，设 CD=X,则2222257(8)xADxA B C D 东北A B C D 文档编码:CA8X

22、2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T

23、8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P

24、10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2

25、B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL1

26、0C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z

27、8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编

28、码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2解得52x（3 分）22555()322AD（2 分）158310 322ABCS（1 分）6、（杭州市20XX年中考数学模拟）如图，在边长为6 的正方形ABCD中，点P在AB上从A向B

29、运动，连接DP交AC于点,Q连接.BQ试证明：无论点P运动到AB上何处时，都有;ADQABQ当ADQ的面积与正方形ABCD面积之比为1:6 时，求BQ的长度，并直接写出此时点P在AB上的位置.答案：(1)证明：在正方形ABCD中，ADABDAQBAQAQAQADQABQ(2)解：ADQ的面积与正方形ABCD面积之比为1:6 且正方形面积为36 ADQ的面积为6 过点Q作QEAD于,EQFAB于,FADQABQQEQF162AD QE2QEQF90BADQEAQFA四边形AEQF为矩形2AFQE624BF在Rt QBF中，2222242 5BQQFBF此时P在AB的中点位置(或者回答此时3AP)

30、ABCDPQABCDPQEF文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10

31、C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8

32、R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码

33、:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2

34、J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8

35、 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P1

36、0D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R27（2012 广西贵港）（本题满分11 分）如图所示，O的直径6AB，AM和BN是它的两条切线，D为射线AM上的动点（不与A重合），DE切O

37、于E，交BN于C，设yBCxAD,（1）求y与x的函数关系式；（2）若1O与O外切，且1O分别与CDBC、相切于点GF、，求x为何值时1O半径为答案：解：（1）如图所示，作BNDP，垂足为P 1 分AM和BN是O的两条切线090BA四边形ABPD为矩形xBPADABDP,6xyBPBCPC 2 分DE切O于ECBCEDEDA,yxCEDEDC 3 分由222DCPCPD，得222)()(6yxxy 4 分即xy9（0 x）5分（2）连接OC则OC平分BCD，6 分1O分别与CDBC、相切，1O在BCD的角平分线OC上，连接FO1，则BCFO1，作ABQO1，垂足为Q，则四边形QBFO1为矩形

38、7 分当1O半径为 1 时，,213OQ4131OO，8 分32,301011QOBFQOOFCO，3FC 9 分33FCBFBC 10 分33399yx，即当x为3时，1O半径为 1 11 分、AB C D M N E G F O O1 O1 QP文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA

39、8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F

40、3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD

41、4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2

42、Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 Z

43、L10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V

44、8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2文档编码:CA8X2J5F3T8 HD4P10D2Z2B6 ZL10C3V8Z8R2