1、 2018 . 10 30 1. x m 2 x 2 +2x+1=0 m A. B. m 3 C. m 3 D. 2. ABCD 2 DAB=60 AC A. 1 B. C. 2 D. 2 3. ABCD A a 2 B 1 C 2 c a c A. a= 1 c= B. a= 2 c= 2 C. a=1 c= D. a=2 c=2 4. ABC 1 ABC 2017 A. B. C. D. 5. ABC C= D AC DE AB E AC=8 BC=6 DE=3 AD A. 3 B. 4 C. 5 D. 6 6. 40 45% 15% A. 16 B. 18 C. 20 D. 22 7.
2、1 3 100 A. 30 B. 10 C. 30 D. 10 8. 2 3 A. x 2 5x+6=0 B. x 2 5x 6=0 C. x 2 +5x 6=0 D. x 2 +5x+6=0 9. 2015 16.9 2013 10 2013 2015 x A. 10 1+x 2 =16.9 B. 10 1+2x =16.9 C. 10 1 x 2 =16.9 D. 10 1 2x =16.9 10. 1 ABC tan ABC A. 1 B. C. D. . 8 24 11. ABC EFPN E F AB N AC 1 ABC A EFPN 2 ABC 3+2 1 _ 12. ABC C
3、=90 AB=8 AD ABC CD=2 ABD _ 13. ABC D BC DE BC AB E DF AC F EDF _ 14.sin 2 1 +sin 2 2 88 +sin 2 89 =_ 15. 12cm 2 acm hcm a h _ _ 16. ABC DEF ABC DEF 1 3 ABC DEF _ 17. x 2 +px+q=0 2 7 1 10 _ 18. ABC AB=AC CD AB D D AB tanA=_ . 6 36 19. AB BC 16 CD 8 AB BC 45 .1 EF FG 2 20. ABC D E AC AB AE=EB AED CBD
4、21. D ABC BC D DE AB DF AC AC AB E F BE CF DF DE N M MN DMN 22. 1 15m 3 2 x 1 x 2 x 23. a b c a b c=3 2 6 a+2b+c=26 1 a b c 2 x a b x 24. n x 2 +2x 8=0 x 2 +22x 82 2 =0 2 +2nx 8n 2 =0 x 2 +2x 8=0 2 +2x=8 2 +2x+1=8+1 x+1 2 =9 1 =4 x 2 = 2 1 2 n x 2 +2nx 8n 2 =0 n . 10 25. x x 2 m+2 x+2m=0 (1) (2) m=2
5、 2018 . 1. D x m 2 x 2 +2x+1=0 m 2 2 4 m 2 m D ax 2 +bx+c=0 =b 2 4ac m 2 2 4 m 2 m 2. D AC BD O ABCD AC BD OA=OC AD=AB=2 DAB=60 ADB OA= AB= AC=2OA=2 D AC BD O AC BD OA=OC AD=AB=2 ADB OA= AB= AC=2OA=2 3. B ABCD OA=OC O A C A a 2 C 2 c a= 2 c= 2 B A C a c 4. C ABC ABC ABC = 2017 C 5. C Rt ABC AB ABC A
6、DE . C=90 AC=8 BC=6 , C=90 DE AB A= A, ABC ADE, . C. . 6. A 45% 15% 1 45% 15%=40% 4040%=16 A 45% 15% 7. D - Rt ABC tanA= AB=100 BC=x AC=3x x 2 + 3x) 2 =100 2 x=10 ) D 100 8. D 2 3 x 2 +ax+b=0 2 + 3 = a=5 2 3 =b=6 x 2 +5x+6=0 D 2 3 x 2 +ax+b=0 2 + 3 = a 2 3 =b 9. A 2013 2015 x 10 1+x 2 =16.9 A 2013 1
7、+ 2 =2015 a b x a 1x 2 =b 10. D Rt ABD BD=4 AD=3 tan ABC= = D . 11. 3 - 1 2 x ABC x x+ x+ x=3+2 x=3 3 1 EFPN 2 12. 8 DE AB E AD ABC C=90 DE AB DE=DC=2 ABD = ABDE=8 8 DE AB E DE 13. 60 ABC A= B=60 DE BC AB E DF AC F BDE= AFD=90 AED BDE AED= B+ BDE=60 +90 =150 EDF=180 A AED AFD=360 60 150 90 =60 60 A=
8、 B=60 DE BC AB E DF AC F BDE= AFD=90 AED 14. 44 sin 2 l +sin 2 n 2 88 +sin 2 89 = sin 2 l +sin 2 89 + sin 2 2 +sin 2 88 sin 2 44 +sin 2 46 +sin 2 45 =44 44 sin 2 2 90 sin 2 l +sin 2 89 =sin 2 2 +sin 2 2 44 +sin 2 46 =1 89 1 44 sin 2 45 15. a=12h a=12h a=12h = 0 16. 1 9 ABC DEF ABC DEF 1 3 ABC DEF 1 3 ABC DEF 1 9 1 9 17. x 2 +9x+14=0 x 2 +px+q=0 2 7 q=27=14 x 2 +px+q=0 1 10 p= 1 10 =9 x 2 +9x+14=0 x 2 +9x+14=0 q=27=14 p= 1 10 =9 18. 2 AB=AC=a AD= AD= Rt ACD CD= = = tanA= = AD= AD Rt ACD CD= = = tanA= = =2 2 CD D AB . 19. CM AB AD M MN AB N MCD PQR = = CM=4 MN
