1、 2018 : 1. 4 120 100 2. 0.5 2B 3 2B 4. 0.5 12 36 3 . 1. A. B. C. D. 1 2. x -1 x +2 =x -1 A.x = -2 B. x1=1 x2=-2 C. x1= -1 x2=1 D. x1= -1 x2=3 3. A. B. C. D. 4. 2x 2 +1=2 x A. B. C. D. 5. CD EF G 6. A -1 -2 OA O 9 OA A a b a-b A. 3 B. -1 C.-3 D.1 7. y=3 x-4 2 -2 A. B. x=-4 C. 2 D. x 3 y x 8. 2015 100
2、0 2017 1440 x A. 1440 1-x 2 =1000 B. 1000 1+x 2 =1440 C. 1440 1+x 2 =1000 D. 1000 1-x 2 =1440 9. 2 A. 2x 2 -4x+3=0 B. 2x 2 -2x-3=0 C. 2y 2 +4y-3=0 D. 2t 2 -4t-3=0 10. y=x 2 +4x+3 y=x 2 A. 2 1 B. 2 1 C. 2 1 D. 2 1 11. 3 ABCDEF AC 12. y=ax 2 +bx+c -1 0 x=2 1 4a+b=0 2 4a+c 2b 3 5a+3c 0 4 A -2 y1 B y2 C
3、 y3 y1 y3 y2 A. 2 B. 3 C. 4 D. 1 6 24 4 13. x=1 x x 2 +x+2k=0 14. 15. 20 / h t h=20t-5t 2 16. PA A PO B C AB 16 17 18 17. C AB= BC=1 18. y =mx+n y=ax 2 +bx+c A -1 p B 4 q x mx+n ax 2 +bx+c 6 60 19. 5 10 1 4x 2 +4x-3=0 2 0.3y 2 +y=0.8 20. 8 1 2 3 4 x y 1 x y 2 x y y=x 2 21. 10 O CD=6 A B OABC A EF BD
4、 CD CB E F AO BD G 1 EF O 2 AE 22. 10 40 80 y x x / 50 60 70 y 100 80 60 1 y x 2 W W x = - 3 2 W x 23. 10 y=x+m x A -1 0 C 1 -4 1 2 x B y=x+m D ABD 24. 12 ABCD OEFG 1 O ABCD A OG O B OG OG AB M OE AD N 1 1 NC NC=NA M 1 NA M =4 DN=2 CD 2 2 B OG DN AN CD 3 3 AN DN AM BM 2017 2018 12 36 3 1 2 3 4 5 6 7
5、 8 9 10 11 12 B C C C D A D B D D C A 6 24 4 13. x=-2 14. 15. 2 16. 20 17. -1 18. x -1 x 4 6 60 19. 1 5 4x 2 +4x+1=4 2x+1 2 =4 2x x1= x2=- 2 5 0.3y 2 +y-0.8=0 b 2 -4ac=1 2 - -0.8 =1.96 y= = y1= y2=-4 20. 1 4 1 2 3 4 1 1 1 1 2 1 3 1 4 2 2 1 2 2 2 3 2 4 3 3 1 3 2 3 3 3 4 4 4 1 4 2 4 3 4 4 2 4 16 y=x 2
6、 2 1 1 2 4 P = = 21. 1 CD DBC BD BC OABC AO BC BD OA EF BD OA EF EF O 5 2 OB OABC OA=BC OB=OC=OA OB=OC=BC OBC C AOE C Rt OAE AEO=30 OE=2OA=6 AE=3 10 22. 1 y x y=kx+b y x y=-2x+200 3 2 W= x-40 -2x+200 =-2x 2 +280x-8000 W x W=-2x 2 +280x-8000 6 3 W=-2x 2 +280x-8000=-2 x-70 2 +1800 W x W x x=70 W W=180
7、0 W x W x 70 1800 10 23. 1 y=a x-1 2 -4 A -1 0 0=a x-1 2 -4 a=1 y= x-1 2 -4 y=x 2 -2x-3 5 2 y=x 2 -2x-3=0 x1=-1 x2=3 B 3 0 A -1 0 y=x+m -1+m=0 m=1 y=x+1 D 4 5 AB=4 ABD = 10 24. 1 ABCD OA=OC EFGO NC=NA 2 NA=NC=4 DN=2 CD 2 =NC 2 -ND 2 CD= =2 4 2 NB 2 =NA 2 +CD 2 1 NB ABCD OB=OD AB=CD EFGO ND=NB NB 2 =NA 2 +AB 2 =NA 2 +CD 2 8 3 AN 2 +AM 2 =DN 2 +BM 2 2 GO CD H MN HN ABCD OB=OD OBM= ODH BOM= DOH BOM DOH BM=DH OM=OH EFGO MN=MH Rt NDH NH 2 =DN 2 +DH 2 =DN 2 +BM 2 Rt AMN MN 2 =AM 2 +AN 2 DN 2 +BM 2 =AM 2 +AN 2 12
