1、 2017 8 3 24 . . 21 1 3 A B A B A 4 B 2 C 2 D 4 2 a 4 A a 4 B a 2 2C a 3 +a 3D a 4 a 3 x 2 7x 2=0 A B C D 4 A B C D 5 A B C D 6 2 4 A 6 B 7 C 11 D 12 7 a 1 a 2 a 3 a n a 1 =3 a 2 =7 2017 A 1 B 3 C 7 D 9 8 ABC A 0 2 B 1 0 C 2 1 y=x 2 +bx+1 b 21 A b 2 B b 2 C b 2 D b 2 3 30 9 2017 5 18 16000 16000 10
2、=2 =6 = 11 3x 2 27= 12 ABCD B+ A= 13 13 3 140 4 135 2 130 2 120 1 100 1 80 14 y x y= x+32 15 O ABC AO OAC= 16 A BC D E A BC P DP BC BP=4cm EC= cm 17 A y= OA O A O OB B 18 x 2x+m +4020=0 m 10 96 . . 19 1 2 2 + 2017 0 +|1 | 2 a 3 2a +2 a+1 a 1 20 21 1 2 1000 22 4 A B C D 1 A 2 23 1800 1.2 6 24 ABC BC
3、ABC A ACB CD AA 1 ACCA 2 ABC A B=24 cos BAC= CB 25 OABC A B C O C CD AB AB AO D E AE O F CF 1 DE O 2 CF=OC O 12 26 1 ABC AO BC AB AC AO 2 BO 2 AB AC=AO 2 BO 2 21 1 1 AB=8 AC=6 AO BC AB AC= OC OA= 2 2 ABC AB=AC=4 AB AC BA BC 3 3 ABC AB=AC AO BC N AO ON= AO AB AC=14 BN BA=10 ABC 27 30 / p x / x / 30 3
4、5 40 45 50 p 600 450 300 150 0 1 p x 2 3 1 a a 0 40 x 45 2430 a = 28 ABCD 4 P AB CP P PC AD E PE PEFG G PC EG PF O 1 AP=1 AE= 2 O APE P A B O O 3 P A B APE AB 2017 8 3 24 . . 1 1 3 A B A B A 4 B 2 C 2 D 4 13 AB=| 1 3|=4 D 2 a 4 A a 4 B a 2 2C a 3 +a 3D a 4 a 48 35 46 47 A a 4 5 B a 2 2 =a 4 C a 3 +a
5、 3 =2a 3 D a 4 a=a 3 B 3 x 2 7x 2=0 A B C D AA = 7 2 4 2 =57 0 A 4 A B C D WA D 5 A B C D I9 B B 6 2 4 A 6 B 7 C 11 D 12 K6 x 2 4 4 2 x 2+4 2 x 6 8 C 12 C 11 C 7 a 1 a 2 a 3 a n a 1 =3 a 2 =7 2017 A 1 B 3 C 7 D 9 37 n=3 4 2017 a 1 =3 a 2 =7 a 3 =1 a 4 =7 a 5 =7 a 6 =9 a 7 =3 a 8 =7 6 2017 a 2017 =a
6、1 =3 B 8 ABC A 0 2 B 1 0 C 2 1 y=x 2 +bx+1 b 21 A b 2 B b 2 C b 2 D b 2 H4 C b C 2 1 y=x 2 +bx+1 2 2 +2b+1=1 b= 2 b b 2 C 3 30 9 2017 5 18 16000 16000 1.6 10 4 21 cn jy com 1I a 10 n 1 |a| 10 n n a n 1 n 1 n 21 * 16000 1.6 10 4 1.6 10 4 10 =2 =6 = 12 1D =2 =6 a=2b c= =2 =6 a=2b c= =12 12 11 3x 2 27=
7、 3 x+3 x 3 55 3 =3 x 2 9 =3 x+3 x 3 3 x+3 x 3 12 ABCD B+ A= L5 ABCD B= D A+ B+ B= 13 13 3 140 4 135 2 130 2 120 1 100 1 80 135 W4 13 7 13 3 140 4 135 2 130 2 120 1 100 1 80 7 135 135 135 14 y x y= x+32 40 21*cnjy*com E3 x+32=x x x+32=x x= 40 40 15 O ABC AO OAC= 50 M5 CO AOC=2 OAC CO AOC=2 OAC= 50 16
8、 A BC D E A BC P DP BC BP=4cm EC= 2+2 cm 21 PB KK A= B= AB=BC BD=8cm PD=4 cm AD=PD=4 cm DPE= 21 ABC A= B= AB=BC DP BC PB=4cm BD=8cm PD=4 cm A BC D E A BC P AD=PD=4 cm DPE= AB= 8+4 cm BC= 8+4 cm PC=BC BP= 4+4 cm CE= PC= 2+2 cm 2+2 17 A y= OA O A O OB B y= R7 G6 G7 A m n A AC x C B BD x D AC=n OC= m A
9、C=OD=n CO=BD= m A y= A m n A AC x C B BD x D AC=n OC= m ACO= CAO+ AOC= AOC+ CAO= BOD ACO ODB ACO ODB AC=OD=n CO=BD= m B n m mn= 2 n m =2 B y= y= 18 x 2x+m +4020=0 m 15 AG m= y= x=2017 y 2 m= = m y 0 y=1 m=12 y=2 m=3 m= y= x=2017 y 2 m= = m y 0 y=1 m=12 y=2 m=3 m 15 15 10 96 . . 19 1 2 2 + 2017 0 +|1 | 2 a 3 2a +2 a+1 a 1 4F 2C 35 4A 6E T5 1 = 2 1 = 4+1 2 + 1 = 3 + 1 = 4 2 =3a 2a 2 +2 a 2 1 =3a 2a 2 +2a 2 2 =3a 2 20 CC CB 2x+3 0 x 1.5 5 x 0 x 3 1.5 x 3 1 0 1 2 21 1 48 72 2 1000
