1. 11 --------------------------------------------------------------1. 1 1. 1 2.

2. ( ) 1. 2. 3. 4. 1. 2. 20 " " 3. 6-10 16 A B C D P 10 10-20 ( ) 1 : 5-10 2-3 1 2 3 4. 2 : ( 5 2 ) 2-3 + 1-2 1 3 : 1. 2. 3. " " 4. 4 : " " 5 : () () 4 () () () 5. 1. 20 2. 1 3. 4. 6. 5.6. 1 7. 8./ 9.10. 11. 12. 13.14. : http://www.nectec.or.th/schoolnet/library/webcontest2003/100team/dlns058/good/good.html 7. 2. 1 2-2.5 2 4 0.2 8. 1 1 1.5 7 9. 3 3 ( ) 2 10. 3 11. 4 5 3-4 12. 6 13. : http://www.edutoday.in.th/upload-files/0002560/html/97a424ed3d/1.html3. 2 1 2 1. 2. 3. 4. 14. 5. 1 (15 ) 1 (3.8 ) 3-4 - - - - 2-3 - 2 4 3 2.75 . 57 (1/4 ) 370 1.2 ()1-4 1. 1 4 2. ( ) 3. 1 30 15. 15-20 2-3 4. 2 5. 2-4 - - - 2.8 - 10 2 ( ) 2 1. - - 19 - - - 19 16. - 7.6 2. - 2 - 1 . 1.8 - - - - 2.8 - 10 2 ( ) 2 17. 1. - - 19 - - - 19 - 7.6 2. - 2 - 1 . 1.8 - : http://www.dek-d.com/board/view.php?id=603522.. 30.. 19.. 23.6/14