1、 2018 1 120 150 2 6 3 18 1. A x 2=0 B x 2 2x 3 C x 2 4x 1=0 D xy+1=0 2. 1 12 10 1 2 3 4 5 7 1 1 4 2 3 1 12 A 3.75 B 3 C 3.5 D 7 3. A B C D 4. s 2 cm 561 560 561 560 s 2 cm 2 3.5 3.5 15.5 16.5 A B C D 5. 2 2 2 0 xx A B C D 6. ABCD AB 10 BC 24 B A C D B B B r A r 10 B 10 r 24 C 24 r 26 D 10 r 26 . 10
2、3 30 7. x x 4 2 4 x _ 8. 5cm cm 9. 10 16 20 10. 11. 3cm A l AO=3cm l 12 5 , 7 , 1 , 0 , 4 , 6 , 5 _ 13. 6cm, AB 6cm, AB 14. ABC AB D ACD 15. =ad bc x 2 3x+1=0 x x 4 11 x x = 16. ABC AB=10 AC=6 BC=8 AB O BC P Q AC PQ PQ . 11 102 17 6 1 (x 2) 2 121 0 2 2x 2 +6x-10=0( ) 18. 6 AB AB C AB D AB=16cm CD=4c
3、m 1 2 1 18 9 14 16 19. 8 x x 2 - m x-2=0 (1) x=-1 m (2) m 20. 8 ABCD O A=110 BD=CD 1 DBC 2 O 3 21. 8 (1) (2) 5 5 ( 100 ) . 1 (1) 85 70 (2) 2 1 5 4 3 2 1 70 75 80 85 90 95 100 0 (1) (2) 20 22. 10 60 70 80 90 100 1 2 3 900 90 23 10 r=10cm 40cm 1 2 A SA B 24. 10 x x 2 (2m 1)x m 2 0 x1 x2 1 m 2 2 1 x x
4、m 25. 10 AB O C O AD CD DAC BAC (1) CD (2) AD 6 AB 8 AC. D B O A C 25 26 26. 12 60 50 a 1 x a= x 2 2430 27. 14 AOBC A 0 6 B 12 0 E OB P Q 4 0 x 1 t 1 E 2 AOE N M F 3 P PA P AEBC t N F M .D 28 2017-2018 6 3 18 1 2 3 4 5 6 10 3 30 ( 11 102 ) 7 8 9 10 11 12 13 14 15 16 17 6 1 (x 2) 2 121 0 2 2x 2 +6x-1
5、0=0( ) 18. 6 19 8 (1) (2) 20 8 20 21 8 (1) (2) 23 10 (1) (2) 24 10 (1) (2) 25 10 D B O A C 27 14 N F M .D 28 6 3 18 C B D A C D 10 3 30 7 0 8 10 9 13 10 45 11 12 12 13 0 0 150 30 14 0 61 15 1 - 16 8 11 102 17. 1 9 , 13 2 1 x x 3 2 2 29 2 3 , 2 29 2 3 2 1 x x 6 18. 3 2 10 6 2 19. 1 x=-1 1+ m-2=0 m=1
6、2 x 2 - x-2=0 x 1=-1 x 2=2 x=2 4 2 ac b 4 2 = m 2 +8 5 m m 2 m 2 +80 7 m 8 20 1 ABCD O DCB+ A=110 110 70 BD=CD DBC= C=70 4 2 BO CO C= DBC=70 BDC=40 BOC=80 l= 3 4 180 3 80 8 21. 1 2 70 100 100 75 80 2 = 70+100+100+75+80 3 2 S2 2 =160 6 2 1 8 22. 1 80 120 6 24 36 12=42 80 4 2 120 60 6 70 24 80 42 90 3
7、6 100 12 80 80 8 3 90 30%+10%=40% 90 =360 10 23. 1 10 n=90 3 10 2 + 10 2 6 2 A SA B AB Rt ASB SA=40 SB=20 AB=20 cm 20 cm 10 24. 1 4 1 m 4 2 0 2 1 x x 2 1 , 0 ) 1 2 ( m m 4 1 m 7 2 1 x x 0 4 1 m m 4 1 10 25. 1 5 2 3 4 10 26. 1 2 3 60 x 3 2 7 38 , 2 2 1 x x 11 12 27. 1 A 0 6 B 12 0 OA=6 OB=12 AEO=30 AE=12 OE= 3 6 E 3 6 0 3 2 3 3 3 3 3 3 5 4 3 P AE PA P A 2 AE=6 PA ,OP=2 QP= 4 2 t= 4 2 P O P AC t=4 PA=PB P BC OP=x PB=PA=12 x Rt OAP x 2 +6 2 = 12 x 2 x= 2 9 t=4+ 2 9 = 2 17 t=4 2 4 2 17 14 ( 2 ) 3 1
