1、 C B A O D 2018 8 3 24 1 A 3x 2 + =0 B 2x 3y+1=0 C x 3 x 2 =x 2D 3x 1 3x+1 =3 2 6 11 A B C D 3 12 4 2 6 1 A 12 1B 6 1C 3 1D 2 14 10 10 9.1 S 2 =1.2 S 2 =1.6 A B C D 5 3 3 6 3 5 A 6 B 3 C 4 D 1.6 6 0 2 c bx ax (a 0 a b c ) x A 3 x 3.23 B 3.23 x 3.24 C 3.24 x 3.25 D 3.25 x 3.26 7. 1 A y O x A M N M (
2、4 2) N A ( 1 2) B (1 2) C ( 15 2) D (1.5 2) 8. 2 ABCD O BC AD AB=CD AB = 1 BC = 2 OA A 2 3 1 B 2 C 3 2 3 D 2 5 1 x 3.23 3.24 3.25 3.26 c bx ax 2 0.06 0.02 0.03 0.09 9 O 10 P O 5 P O 10 x x+1 = x+1 11 3 ABCD O E BC A=50 DCE 3 4 5 12. 168 128 x 13. 14 x k 1 x 2 +4x+1=0 k 15. 4 3 ABCD A AB DAB 16 x1 y1
3、 x2 y2 x3 y3 y=3x 7 x1 x2 x3 3 y1 y2 y3 17 40 ( ) 18 5 AB O AB=10 AC 8 D BC AD CP AD P BP BP ( 96 .) 2 20 8 5 5 (1) (2) (3) 2 23 8 (1) (2) P1 (3) P2 P1 P2 24 10 AB O C BD CE AB E BD CE F 1 CF BF 2 2 AD O 3 BC 27 12 0 3 2 a 1 3 2 a 1 1 1 3 2 a 0 a 1 0 3 2 a 1 3 2 a 1 1 1 3 2 a 0 a 1 x= 2 x= 2 (3) 16m
4、 ? 2 3 24 1 2 3 4 5 6 7 8 D C B A A C A A 17 3 20 18 13 2 4 19 10 5 2 4 17 3 x 3 , 2 2 1 x x (1)85 85 80 2 2 3 30 9 10 x= 1 11 50 12 168 1 x 2 =128 13 3 1 14 k 5 k 1 15 9 16 27 2 2 2 2 23 (1) 1 4 2 (2) P1= 1 3 6 3 1 (3)P1P2 8 OH 2 2 BH= 2 2 3 2 300+1000m + 2 + 2 + 2 2 2 =10, PD 2 +DE 2 =PE 2 27 1 3 4 2 1 5 6 1 3 x x 16-2x =-2 x-4 2 +32 (10 x=4 -2 x-4 2 +32 32. 4 32 12 2 3 4 3 5 5 4 b 2 =OF 2 2 =4 2 5 4 2 2 =4FM 2 2 5 4 2 b 2 ( P
