1、 2017 2018 1. 6 120 90 2 0.5 3 2B 4. 0.5 36 12 36 3 0 1. A 2cm 4cm 6cm B 8cm 6cm 4cm C 14cm 6cm 7cm D 2cm 3cm 6cm 2. ( ) 3. C D 4. ( ) A 60 B 75 C 90 D 105 5. ABC A B C : A. AB=A B A= A AC=A C B. AB=A B A= A B= B C. A= A B= B C= C D. AB=A B A= A C= C 6. 18 cm BC 8 cm ( ) A 8 cm B 2 cm 8 cm C 5 cm D
2、8 cm 5 cm 7. AB AC AD BE CF ( ) (1)AD EDF EBD FCD (3)BD CD (4)AD BC. A 1 B 2 C 3 D 4 8. AB AC 20 cm DE AB E AC D 35 cm BC ( ) A 5 cm B 10 cm C 15 cm D 17.5 cm 9. 1 A B C D 10. AB AC A 30 B BC AC D BD ( ) A 30 B 45 C 60 D 90 11 BE=CF AE BC DF BC Rt ABE Rt DCF A AE=DF B A= D C B= C D AB=DC 12 ABCD EB
3、ED ( ) A 1 B 2 C 3 D 4 84 6 4 24 13. 14 M 3 b N a 2 x a+b= 15 4 8 16 40 17. Rt ABC B 90 AB 3 cm S ABC 6 cm 2 C A DE . 18. 10 7 60 19. 7 A,B A,B 20. 7 AC DE 1 D 21. 7 C E F B A D BC AB CD AE DF A AB CD 22. 9 ABC D BC AD EDC EB DE DC AB AC . 23. 9 D E AC AB BD CE O CD OC. (1) ( ) (2) (1) 24. 9 AB=AC D BC D E F 1 DE=DF 2 BE=1 25. 12 A C B DAC EBC AE BD CD CE M N 1 AE=BD 2 CMN N M A B D E C