1、 2015-2016 学年北京市丰台区八年级(上)期末 数学试卷 30 3 1 x A x B x C x 0 D x= 2 A 4 B 3 C 2 D 1 3 A B 9 C D 360 4 A B C D 5 6.1 A B 3 C 4 D 5 6 5 6 A 16 B 17 C 16 17 D 10 12 7 A B C D 8 8a 2 b 2 = 6a 3 ab =a A 1 B 2 C 3 D 4 9 x 1 A x 1 B 1 x C x 1 D x+1 10 14cm A 1 B 2 C 3 D 4 18 3 11 = 12 x 13 3 4 14 AB DC A=23 D=3
2、1 AED=143 “ ” “ ”15 AOB=45 A 1 A 2 A 3 OA B 1 B 2 B 3 OB A 1 B 1 OA A 2 B 2 OA A n B n OA A 2 B 1 OB A n+1 B n OB n=1 2 3 4 5 6 OA 1 =1 A 6 B 6 16 n=1 a 1 = +2 b 1 = +2 c 1 =1+2 n=2 a 2 =b 1 +2c 1b 2 =c 1 +2a 1c 2 =a 1 +2b 1n=3 a 3 =b 2 +2c 2b 3 =c 2 +2a 2c 3 =a 2 +2b 2 1 a 1 +b 1 +c 1 = 2 n 19 17 1
3、9 5 20 4 17 18 19 20 17 21 5 22 23 6 21 E F BC BE=FC AB=DC B= C A= D 22 a=3 23 ABC AC D BC E CE=CD BD=DE 10 24 6 25 4 24 “ ” 2013 25 000 600 2015 50 000 2013 1.2 2015 25 ABC A ABC 6 26 ABC M BC m A B M C BD m D ME m E CF m F m B 1 1 m B 2 3 BD ME CF 2 3 2 1 数学试题答案 30 3 1 0 2x 1 0 x B 0 2 A 3 A 9 B C
4、 360 D D 4 A B C D B 5 2 3 6.1 3 4 5 6 4 C 6 6 5 6 6 6 5 17 5 5 5 6 16 16 17 C 7 A A B a=0 B C a=0 C D D D 8 = = = 6a 3 = = =a = = C 9 x 1 x 1 x 1 0 =|x 1|=1 x B =|a| 10 14 1 2 2 6 6 3 3 5 6 4 4 4 6 4 5 5 4 2 6 6 3 5 6 4 4 6 4 5 5 4 D 18 3 11 =3 3 12 x+1 0 x 1 x 1 a 0 13 1 5 2 4 5 14 AB DC F F E G A
5、+ AFG + D+ DFG = AEG+ DEG= AED=143 A=23 D=31 AFD= AFG+ DFG= AED A D=143 23 31 =89 90 FG 15 A n B n n=6 OA 1 =1 A 1 B 1 =A 1 A 2 =1 B 1 A 2 =B 1 B 2 = A 2 B 2 =A 2 A 3 =2 B 2 A 3 =B 2 B 3 = A 3 B 3 =A 3 A 4 =4 A n B n =2A n 1 B n 1 A 1 B 1 =1 A n B n =2 n 1 n=6 A 6 B 6 =2 6 1 =2 5 =32 32 A 2 B 1 = A
6、2 B 1 =2 q=2 a 1 =1 A n B n =12 n 1 =2 n 1 A 6 B 6 =2 6 1 =32 16 1 a 1 +b 1 +c 1 2 a n +b n +c n =3 n 1 a 1 +b 1 +c 1 =3 n + +1 n 1 a 1 +b 1 +c 1 = +2 + +2+1+2 =3 +3 +3 2 a 2 +b 2 +c 2 =b 1 +2c 1 +c 1 +2a 1 +a 1 +2b 1 =3 a 1 +b 1 +c 1 a 3 +b 3 +c 3 =b 2 +2c 2 +c 2 +2a 2 +a 2 +2b 2 =3 a 2 +b 2 +c 2 =
7、3 2 a 1 +b 1 +c 1 a n +b n +c n =3 n 1 a 1 +b 1 +c 1 =3 n 1 3 +3 +3 =3 n + +1 81 +1 n 4 n 4 1 3 +3 +3 2 4 a n +b n +c n 19 17 19 5 20 4 17 = = = 18 = + =2 + = + =2 + =2 19 x 2 x 2 x+x 2=4 2x=6 x=3 x=3 x=3 20 15 5 15 5 P = 17 21 5 22 23 6 21 ABF DCE A= D BE=FC BE+EF=CF+EF BF=CE AB=DC B= C ABF DCE SAS A= D 22 a=5 = = a=3 = 23