1 session 1986 Tianjin Nankai University
No.2 1987 beijing beijing University
The Third Shanghai Fudan University 1988
Fourth place 1989 Hefei University of Science and Technology of China.
1990 Zhengzhou No.5 Middle School Student Mathematics and Physics Editorial Department
6 199 1 year Wuhan Huazhong normal university
No.7 1992 beijing beijing Mathematical Olympic Development Center.
No.8 1993 Jinan Shandong University
The 9th Shanghai Fudan University 1994
10 1995 Hefei University of Science and Technology of China
1 1 session 1996 Tianjin Nankai University
12 1997 Hangzhou Zhejiang University
No. 13 1998 Guangzhou Normal University
Beijing beijing University14th Session 1999
15 2000 Hefei University of Science and Technology of China
16 200 1 Hong Kong Mathematical Olympic Committee
17 Shanghai Middle School in 2002
2003 18 Changsha No.1 Middle School
19 2004 Macao Mathematical Olympic Committee
Ranked 20th in Zhengzhou Foreign Language School in 2005.
21Fuzhou No.1 Middle School in 2006
2007 22nd Wenzhou Wenzhou Middle School
No.23 Middle School Affiliated to Harbin Normal University in 2008
The 24th Hainan Jiaji Middle School in 2009
25 Chongqing Nankai Middle School 20 10
No.26 Middle School Affiliated to Changchun Northeast Normal University 20 1 1
27th 20 12 Xi An Northwestern Polytechnical University
28th 20 13 1 Shenyang Northeast Yucai School
29th 20 13 12 Nanjing middle school affiliated to Nanjing normal university.
30th 20 14 12 Chongqing Bashu Middle School
No.365438 +0 2015121517 Yingtan No.1 Middle School, Yingtan City.
Question 1:AE= 3cm, EF = 5cm£»; Let AE=x, then EF = 8-x, AE=4, ¡Ï A = 90, ¡à x=3, ¡àAE="3" cm, EF="5" cm.
Problem 2: solution: as shown in figure 1, ¡Ò¡Ïmfe = 90,