18届初二希望杯答案

http://www.zhongkao.cn/News/2007-03/613753564362418.shtml
1.B 2.C 3.A 4.B 5.C 6.C 7.A 8.A 9.C 10.C
11.12 12.9 13.正负根2 14.13 15.27 16.4 17.180 18.6
19.-2或1 20.4500`
21.-10;-4 22.4001;8004 23.3800;4500 24.y=-(根3)x+2(根3);y==-(根3)x-2(根3) 25.11;31

太难找了．．．