1、 2017-2018 150 8 3 24 1. x ( ) A.ax 2 +bx+c=0 B.2(x x 2 ) 1=0 C.x 2 y 2=0 D.mx 2 3x=x 2 +2 2. A.8x 2 5x+2=0 B.x 2 3x+2=0 C.x 2 3x 2=0 D.10x 2 3x 2=0 3. O 1 AO=d x x 2 2dx+1=0 A O A. O B. O C. O D. 4. A. B. C. D. 5.A B O 5 AB=5 2 OAB=( ) A.90 B.45 C. 60 D.120 6. A. B. C. D. 7. m n 2 m ,n x x 2 8x+a 1
2、=0 a A.13 17 B.11 15 C.17 D.15 8. a=2+ 7 b=2 7 (7a 2 28a+m)(5b 2 20b-10)=10 m A. 19 B. 20 C.19 D.20 10 3 30 9 x 3x 2 x 2=0 _ 10 O AOB=50 AC = BD , COD=_ 10 11 x1 x2 x 2 4x+1=0 x1x2=_ 12 16 12 _ 13 x 1 x 2x1 _ 14 14400 16900 x _ 15 y1=x 2 9 y2=3 x y1=y2 x _ 16 ABCD O AD BC E AB DC F E+ F=80 A=_ 17 O
3、ABC AB=AC O BC 6 10 AB _ 18 18 A 5 a 7 y= 3 4 x 3 A BC 56 5 a _ 10 96 19. 8 (1)x 2 4x 45=0 (2)x 2 4 2x+8=0 16 18 20. 8 A B C A 0 4 C 6 2 (1) (2) M M _ 21. 8 x x 2 3x 1 0 2 35 ( 2 ) 3 6 2 x x x x x 22. 8 A B C O D AC BA=BD DB O E (1) CD=CE (2) C AD AB O 23. 10 x (m-2)x 2 +2mx+m+3=0 (1) m (2) m 24. 10
4、 , ABCD O ABC= BDC=60 .BC=3 (1) ABC (2) OE BD OF CD EF EF A B C 20 22 24 25. 10 2014 1000 2015 2014 10% 2016 2015 100 (1) 2016 (2)2015 2014 1 2014 1700 ( = ) 2014 2014 2.5 2015 2016 a 2016 _ a 2016 2014 a 2016 _ a 2016 80 25% a 26. 10 (1) 1 2 3 1 1 x 2 -2x=5x-12 2 x 2 -3x=7x-243 x 2 -4x=9x-40 (2) x 2 -bx=(a-1)x-ab x1=6 x2=10 a=_ b=_ (3) x 1 x 2 - 10 x= 21 x-220 _ 27. 12 1 BC O A D O DB OA BC=10 AC=6 (1) BA DBC (2) DB (3) (2) E CB AE AE 28. 12 1 ABC D BC ADF=60 , F AC (1) ABD DCF (2) AB=6 BD AF= 31 6 (3) 2 AD DE,BE DE, AD=14,BE=22, C DE ABC ABC 27 1 27 2 28 1 28 2
