1、 1 2017 120 120 3 6=18 1. A B C D 2. A 1 2B 1 3C 1 4D 1 83 1 x 2 x x 2 +3x=-1 12 xx A 1 B 1 2 C 3 D 2 4. 10cm 8cm A 10cm 2B 20 cm 2C 40 cm 2D 80 cm 2 5. E AD BE AC F AF CF 4 5 F E A B C D 6 E F G A C B D 2 A 1 2 B 1 3 C 2 3 D 2:5 6. ABC AB AC 18 BC 12 DEFG E F ABC D G AB AC AD AG DG 6. F BC A 1 B 2
2、C 12 6 6 D 6 2 6 3 6=18 7. 0 5 12 ab ab a 8. 1 x 2 2 3 0 x mx m= 9. 7 5852 7 x 10. x 2 2 1 0 mx x m 11. ABC DE BC 2 3 AD DB S ABC 8 S BCED 12. OABC O(0,0) A(8,0) B(8,4) C(0,3). M OA C O M A B M M (6 5=30 ) 13. 2 2 1 0 xx 2 2 4 1 0 xx 11 E D A B C 12 3 14. 1 ABCDEF AB EF AF CD. l l ABCDEF 2 l ABCDEF
3、AF CD G H l ABCDEF G H AF CD AG=CH FG=DH AG=DH FG=CH. . 15. A B a b (1) (2) ( ) 16. ABCD E F G H AE BF CG DH EFGH 17. D E ABC AC AB AE 3cm AC 4cm ,BC=6cm 3 4 AD AB DE H G F D A B C E A B C D E F 14 B a b D E C B A 4 (8 4=32 ) 18. ABCD M BC AM BD G ABM= BAM 1 AG=BG 2 M BC 1 BMG S ADG 19. ABCD AB=3 BC
4、=4 A C EF AEF 20. 16 / 20 / 200 1 10 . 1350 1500 18 5 21. x 0 4 2 m x x 1 m 2 x1,x2, 5x1+2x2=2, m (22 10 23 12 ) 22. n n 1 AB 1 BC 2 ABCD 1 1 2 3 2 ABCD EB E AD A BC F ABFE ABFE 2 ABCD 1 a, a1 3 ABCD a 1 D C B A E F A B C D 2 6 23. 1 Rt ABC B BC=2AB=8 D E BC AC DE. EDC C . 1 0 _ _ BD AE 180 . _ BD AE 2 360 DB AE 2 . 3 EDC A D E BD . E D C A B C A B 2 E D C A B 1 7 8 9 10 11
