1、 2018 10 21 22 23 24 25 26 27 28 3 30 1. 453 25900 25900 2. AC BD O OA=OC, OAB OCD , _ 3. y= 1 2 x x x . 4. y=3(x-2) +5 . 5. 0 1 3x mx 2 m _ 2 1 2 1 y2 2 8. x a 2 x 1 1 a _ 9. 2 2 y x x m x 2 20 x x m 10 ABCD 3 4 DAC DC E P Q AD AE DQ+PQ . 3 30 yxO14 O D C B A A P D C10 B Q E 11. A a - b 2 = ( b a )
2、 B (a + b) 2 = a 2 + b 2C a -1 a 3 = a 2D a 12 a 6 = a 2 A B C D 13. x 22 ( 1) 1 0 a x x a 0 a A 1 B 1 C 1 1 D 1 214. 2 yx 2 A 2 ( 2) yx B 2 2 yx C 2 ( 2) yx D 2 2 yx 15. m x 2 -2x-3=0 2m 2 -4m A -1 B. 0 C. 1 D.6 16 ax 2 -5x+3=0 3a+60 ( ) A a-2 B a-2 a 0 D a 1 217 y ax 2 bx c x 1 (3,0) ( ) A abc 0 B
3、 2a b 0 C a b c 0 D 4ac b 2 0 17 18 . ab0 y ax 2 y ax b ( ) 19. ABCD ABCD A B C D E F B CD E AF CD 12 AF A. 3 4 B. 2 4 C. 3 8 D. 8 1 1B1=A1A2 2B2=A2A3 3B3=A3A4 AnB 60 21. 6 2011 5 1 2 m = n = C 2 23 7 y=ax 2 +bx+c x A B A (-1 0) C(0 5) (1 8) M . (1) (2) MCB s MCB 24. 7 ABCD 4cm E F DC BC BF 1cm CE 2
4、cm BE DF G CEGF 25. 8 x 2 (3 1) +2 1 0 mx m x m 1 m 26. 8 ABCD AB=CD,AD=BC.AB 4 BD A E DE BC F EF=3. (1) BEF DCF; 2 BC 26. 9 y 3 x 1 A B C D E F 2 3 AD 28. 9 C(1,0) y=x+m A B A (3,4) B y . 1 m 2 P AB P A B P x E PE h P x h x x 3 D AB AB P DCEP P . E B A C P O x y D 2017-2018 3 30 1 2.59 10 4 2. 3.x
5、1 x 2 4. 2,5 5.m 4 9 m 0 6.y1 y2 7.(-3,0) 8. a 1 a 2 9.x1=-2,x2=4 10.2.4 (11- 20 3 30 ) CDAAD CDDCC 21. 22. + 2 =m 2 +4 2 2 1= 2 23. 1 y=-x 2 +4x+5 2 y=0 x-5 x+1 =0 x1=5 x2=-1 B 5 0 y=-x 2 +4x+5=- x-2 2 +9 M 2 9 ME y E S MCB=S MEOB-S MCE-S OBC= 1 2 2+5 - 1 2 - 1 2 24. B A 0 4 B 0 0 C 4 0 D 4 4 E 4 2
6、 F 1 0 BE y kx BE E 4k 2 k 2 1 BE y 2 1 x 1 DF y 3 4 x 1) 2 1 2 G 5 8 5 4 CEGF S S S 2 1 4 2 2 1 1 5 4 5 1825. , (3 1), 2 1(1 ) a mb m c m =b 2 -4ac= 3m-1 2 +4m(1-2m)=1, m=2 0 3 m=2.(4 ) m=2 x1=1, x2= 3 2 . 26. 1 2 8 27 1 3000-1000 / 2 10 AB y=kx+b B 0 800 C 5 550 AB AB y =50x+800 x=10 y=300 300 3 1
7、5 300+ 3000-1000 - =2050 A 0 300 D 15 2050 AD AD y =350x-3200 28.(1) A(3,4) y=x+m 4=3+m. m=1. y=a(x-1) 2 . A(3,4) y=a(x-1) 2 4=a(3-1) 2 , a=1. y=(x-1) 2 . y=x 2 -2x+1. (2) P E yP yE . PE=h=yP-yE =(x+1)-(x 2 -2x+1) =-x 2 +3x. h=-x 2 +3x (0 x 3). (3) . 1 DCEP PE=DC. D y=x+1 , D (1,2), -x 2 +3x=2 . x 2 -3x+2=0 . x1=2 x2=1 ( ) P (2,3) DCEP . 2 DCEP BP CE. CE y=x+b. CE C(1,0), 0=1+b, b=-1 . CE y=x-1 . 1 2 1 2 x x y x y x 2 -3x+2=0. x1=2 x2=1 ( ) P (2,3) DCEP .
