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2017年数学中考三角形专题训练(word含答案).pdf

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1、 2017 年数学中考三角形专题训练1(2016 泰安如图，在四边形ABCD中，AC平分 BCD，AC AB，E是 BC的中点，AD AE 1求证：AC2=CDBC；2过 E作 EG AB，并延长EG至点 K，使 EK=EB 假设点H是点 D关于 AC的对称点，点F 为 AC的中点，求证：FHGH;假设 B=30，求证：四边形AKEC是菱形.2(2016 泰安 1已知：ABC是等腰三角形，其底边是BC，点 D在线段 AB上，E是直线 BC上一点，且DEC=DCE，假设 A=60如图求证：EB=AD;2假设将 1中的“点D在线段 AB上”改为“点D在线段 AB的延长线上”，其它条件不变如图，1

2、的结论是否成立，并说明理由；3假设将 1中的“假设A=60”改为“假设A=90”，其它条件不变，则的值是多少？直接写出结论，不要求写解答过程3 2016 资阳如图，“中国海监50”正在南海海域A处巡逻，岛礁 B上的中国海军发现点A在点 B的正西方向上，岛礁 C上的中国海军发现点A在点 C的南偏东30方向上，已知点C在点 B的北偏西60方向上，且B、C两地相距 120 海里1求出此时点A到岛礁 C的距离；2假设“中海监50”从 A处沿 AC方向向岛礁C驶去，当到达点A时，测得点 B在 A的南偏东75的方向上，求此时“中国海监50”的航行距离注：结果保留根号文档编码:CU7C1Z1D1R3 H

3、S8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY

4、9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编

5、码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3

6、 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3

7、ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文

8、档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1

9、R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I10文档编码:CU7C1Z1D1R3 HS8V1I3Z6N3 ZY9U2K5S4I104 2016 资阳在 RtABC中，C=90，Rt ABC绕点 A顺时针旋转到Rt ADE的位置，点 E在斜边 AB上，连结BD，过点 D作 DFAC于点 F1如图 1，假设点 F 与点 A重合，求证：AC=BC；2假设 DAF=DBA，如图 2，当点 F 在线段 CA的延长线上时，判断线段AF与线

10、段 BE的数量关系，并说明理由；当点 F 在线段 CA上时，设 BE=x，请用含 x 的代数式表示线段AF 文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2

11、文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P

12、3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L1

13、0T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5

14、X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J

15、1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9

16、L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X25.2016 张家界已知：如图，在四边形ABCD中，ABCD，E是 BC的中点，直线AE交 DC的延长线于点F试判断四边形ABFC的形状，并证明你的结论。6

17、 2016 温州如图，E 是?ABCD 的边 CD 的中点，延长AE 交 BC 的延长线于点F1求证：?ADE?FCE2假设?BAF=90 ，BC=5，EF=3，求 CD 的长FEDCBA文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文

18、档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3

19、S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10

20、T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X

21、2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1

22、P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L

23、10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X27 2016 东营如图1，?ABC 是等腰直角三角形，?BAC=90 ，AB

24、=AC，四边形ADEF 是正方形，点B、C 分别在边 AD、AF 上，此时BD=CF，BD?CF 成立1当?ABC 绕点 A 逆时针旋转 0 90 时，如图2，BD=CF 成立吗？假设成立，请证明，假设不成立，请说明理由；2当?ABC 绕点 A 逆时针旋转45 时，如图3，延长 BD 交 CF 于点 H 求证：BD?CF；当 AB=2，AD=3时，求线段DH 的长8 2016苏州如图，在?ABC中，AB=10，?B=60 ，点D、E 分别在 AB、BC 上，且BD=BE=4，将?BDE沿 DE 所在直线折叠得到?B DE 点 B 在四边形 ADEC内，连接 A

25、B ，则 AB 的长为文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文

26、档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3

27、S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10

28、T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X

29、2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1

30、P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L

31、10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2【答案】1、证明：1?AC 平分?BCD.?DCA=?ACB 又?AC?AB，AD?AE，?DAC+?CAE=90 ，?CAE+?EAB=90 ，?DAC=?EAB 又?E 是 BC 的中点，?AE=BE，?EAB=?ABC，?DAC=?A

32、BC，?ACD?BCA，?=，?AC2=CDBC；2 证明：连接AH?ADC=?BAC=90 ，点 H、D 关于 AC 对称，?AH?BC?EG?AB，AE=BE，?点 G 是 AB 的中点，?HG=AG,?GAH=GHA?点 F 为 AC 的中点，文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J

33、1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9

34、L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2

35、C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J

36、1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4

37、R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2

38、I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2?AF=FH，

39、?HAF=?FHA，?FHG=?AHF+?AHG=?FAH+?HAG=?CAB=90 ，?FH?GH；?EK?AB，AC?AB，?EK?AC，又?B=30 ，?AC=BC=EB=EC 又 EK=EB，?EK=AC，即 AK=KE=EC=CA，?四边形 AKEC 是菱形2、1证明：作DF?BC 交 AC 于 F，如图 1 所示：则?ADF=?ABC，?AFD=?ACB，?FDC=?DCE，?ABC 是等腰三角形，?A=60 ，?ABC 是等边三角形，?ABC=?ACB=60 ，?DBE=120 ，?ADF=?AFD=60 =?A，?ADF 是等边三角形，?DFC=120 ，?AD=DF，文档编码

40、:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9

41、HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6

42、ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档

43、编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S

44、9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T

45、6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2

46、文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2?DEC=?DCE，?FDC=?DEC，ED=CD，在?DBE 和?CFD 中，?DBE?CFDAAS ，?EB=DF，?EB=AD；2解：EB=AD 成立；理由如下：作 DF?BC 交 AC 的延长线于F，如图 2 所示：同 1得：AD=DF，?FDC=?ECD，?FD

47、C=?DEC，ED=CD，又?DBE=?DFC=60，?在?DBE 和?CFD 中，?DBE?CFDAAS ，?EB=DF，?EB=AD；3解：=；理由如下：作 DF?BC 交 AC 于 F，如图 3 所示：同 1得：?DBE?CFDAAS ，?EB=DF，?ABC 是等腰直角三角形，DF?BC，?ADF 是等腰直角三角形，?DF=AD，?=，文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码

48、:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9

49、HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6

50、ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档编码:CB9J1J1P3S9 HY5M4R9L10T6 ZB1T2I2C5X2文档

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