(¸ßÒ»ÏÂÊýѧÆÚÄ©18·ÝºÏ¼¯)Ç­¶«ÄÏÊÐÖØµãÖÐѧ2019½ì¸ßÒ»ÏÂѧÆÚÊýѧÆÚÄ©ÊÔ¾íºÏ¼¯

x28?4?8?x(0?x?42) ¡ày?x4xÓÚÊÇ, ¿ò¼ÜÓÃÁϳ¤¶ÈΪ l?2x?2y?2(µ±ÇÒ½öµ±(

2316x)?(?2)x??46?42£¬ 22x316+2)x=,¼´x?8?42mʱµÈºÅ³ÉÁ¢ £¬´Ëʱy?2x2m£¬ÓÃÁÏ×îÊ¡¡£

18£®½â£º ÓÉÌâÒ⣬A£½{x|(x£«a)(x£­1) £¾0}£¬

?UB£½{x|(x£«a)(x£«b)¡Ü0}£¬ M£½{x|(x£«1)(x£­3)¡Ü0}¡£

(1)Èô?UB£½M£¬Ôò(x£«a)(x£«b)£½(x£«1)(x£­3)£¬ ËùÒÔa£½1£¬b£½£­3£¬»òa£½£­3£¬b£½1¡£ (2)Èô£­1£¼b£¼a£¼1£¬Ôò£­1£¼£­a£¼£­b£¼1£¬

ËùÒÔA£½{x|x£¼£­a»òx£¾1}£¬B£½{x|x£¼£­a»òx£¾£­b}¡£ ¹ÊA¡ÉB£½{x|x£¼£­a»òx£¾1}¡£ (3)Èô£­3£¼a£¼£­1£¬Ôò1£¼£­a£¼3£¬

ËùÒÔA£½{x|x£¼1»òx£¾£­a}£¬?UA£½{x|1¡Üx¡Ü£­a}¡£ ÓÖÓÉa?1¡Ê?UA£¬µÃ1¡Üa?1¡Ü£­a£¬½âµÃ£º

22£­1£­5

¡Üa¡Ü£­2¡£ 2

19£®½â£º(1)Éèx1£¬x2Ϊ·½³Ìax2?2c2?b2x?b?0µÄÁ½¸ù£¬

2c2?b2bÔòx1£«x2£½£¬x1¡¤x2£½£­£¬

aa4?c2?a2?4b222a?b?c?ab ¡à(x1£­x2)£½(x1£«x2)£­4x1x2£½£«£½4.¡à2aa2

2

a2?b2?c21

ÓÖcosC?£½£¬¡àC£½60¡ã¡£

22ab1

(2)ÓÉS£½absinC£½103£¬¡àab£½40¢Ù

2

222ÓÉÓàÏÒ¶¨Àí£ºc?a?b?2abcosC£¬¼´c??a?b??2ab?1?cos22????? 3?¼´7??a?b??2?40??1?22??1?? ¡àa?b?13¢Ú£¬Óɢ٢ڵãºa£½8£¬b£½5¡£ 2?20.¸½¼ÓÌâ: (1)½â·¨1£º

a2x2?b2y2?2axby,?(a2?b2)(x2?y2)?(ax?by)2

?ax?by?22µ±ÇÒ½öµ±ax?byʱȡµÈºÅ£¬ËùÒÔax?by?3?6?32½öµ±?a?b?3ʱȡµÈºÅ.

?x2?y2?6?ÈçÈ¡a?b?6,x?y?3,(ax?by)max?32¡£ 2½â·¨2£ºÈý½Ç»»Ôª¡£ax?by?32cos??????32¡£ (2) ¡÷ABCÊÇÈñ½ÇÈý½ÇÐΣ¬¹ÊA?B?ͬÀí?sinB?cosA?0,???2,??2?A??2?B?0,?sinA?cosB?0,

?cosA??cosB???1,???1¡£

?sinB??sinA?3x?cosA?ÓÖx?0£¬??sinB??

2x?cosB??1,??sinA???cosA??1£¬ËùÒÔf?x????sinB??2x?cosB????sinA??3x?2¡£

¸ßÒ»ÏÂѧÆÚÆÚÄ©ÊýѧÊÔ¾í

Ò»¡¢±¾´óÌâ¹²10СÌ⣬ÿСÌâ4·Ö£¬¹²40·Ö¡£ÔÚÿСÌâ¸ø³öµÄËĸöÑ¡ÏîÖУ¬Ö»ÓÐÒ»ÏîÊÇ·ûºÏÒªÇóµÄ¡£ 1. ÔÚÊýÁÐ?an?ÖУ¬an?1?an?2£¬ÇÒa1?1£¬Ôòa4µÈÓÚ£¨ £© £¨A£©8 £¨B£©6 £¨C£©9 £¨D£©7

2. ½«Ò»¸ù³¤Îª3mµÄÉþ×ÓÔÚÈÎÒâλÖüô¶Ï£¬Ôò¼ôµÃÁ½¶ÎµÄ³¤¶¼²»Ð¡ÓÚ1mµÄ¸ÅÂÊÊÇ £¨ £©

£¨A£©

1112 £¨B£© £¨C£© £¨D£© 43233. ÔÚ¡÷ABCÖУ¬Èôa2?b2?c2£¬Ôò¡÷ABCµÄÐÎ×´ÊÇ£¨ £©

£¨A£©Èñ½ÇÈý½ÇÐÎ £¨B£©Ö±½ÇÈý½ÇÐÎ £¨C£©¶Û½ÇÈý½ÇÐÎ £¨D£©²»ÄÜÈ·¶¨ 4. Èôa?b?0£¬ÔòÏÂÁв»µÈʽÖгÉÁ¢µÄÊÇ£¨ £© £¨A£©a3?b3 £¨B£©a?b £¨C£©

1111

? £¨D£©? abab

?x?y?1?0,?5. ÈôʵÊýx£¬yÂú×ã?x?y?0,Ôòz?2x?yµÄ×îСֵÊÇ£¨ £©

?x?0,?£¨A£©?1 £¨B£©0 £¨C£©1 £¨D£©£­1 26. Ö´ÐÐÈçͼËùʾµÄ³ÌÐò¿òͼ£¬Êä³ösµÄֵΪ£¨ £©

£¨A£©2 £¨B£©?£¨C£©3 £¨D£©

1 22 37. ÒÑÖª100¼þ²úÆ·ÖÐÓÐ5¼þ´ÎÆ·£¬´ÓÖÐÈÎÒâÈ¡³ö3¼þ²úÆ·£¬ÉèA±íʾʼþ¡°3¼þ²úÆ·È«²»ÊÇ´ÎÆ·¡±£¬B±íʾ

ʼþ¡°3¼þ²úÆ·È«ÊÇ´ÎÆ·¡±£¬C±íʾʼþ¡°3¼þ²úÆ·ÖÐÖÁÉÙÓÐ1¼þ´ÎÆ·¡±£¬ÔòÏÂÁнáÂÛÕýÈ·µÄÊÇ£¨ £©

£¨A£©BÓëC»¥³â £¨B£©AÓëC»¥³â

£¨C£©ÈÎÒâÁ½¸öʼþ¾ù»¥³â £¨D£©ÈÎÒâÁ½¸öʼþ¾ù²»»¥³â

8. ¿Ú´üÖÐ×°ÓÐÈý¸ö±àºÅ·Ö±ðΪ1£¬2£¬3µÄСÇò£¬ÏÖ´Ó´üÖÐËæ»úÈ¡Çò£¬Ã¿´Îȡһ¸öÇò£¬È·¶¨±àºÅºó·Å»Ø£¬Á¬ÐøÈ¡ÇòÁ½´Î¡£Ôò¡°Á½´ÎÈ¡ÇòÖÐÓÐ3ºÅÇò¡±µÄ¸ÅÂÊΪ£¨ £©

£¨A£©

5421 £¨B£© £¨C£© £¨D£© 9952OBµÄ×î´óֵΪ£¨ £© AB9. ÉèOÎª×ø±êÔ­µã£¬µãA£¨4£¬3£©£¬BÊÇxÕý°ëÖáÉÏÒ»µã£¬Ôò¡÷OABÖÐ

£¨A£©

4554 £¨B£© £¨C£© £¨D£© 334510. ¶ÔÓÚÏîÊýΪmµÄÊýÁÐ?an?ºÍ?bn?£¬¼ÇbkΪa1,a2?ak(k?1,2,?,m)ÖеÄ×îСֵ¡£¸ø³öÏÂÁÐÅжϣº ¢ÙÈôÊýÁÐ?bn?µÄǰ5ÏîÊÇ5£¬5£¬3£¬3£¬1£¬Ôòa4?3£» ¢ÚÈôÊýÁÐ?bn?ÊǵݼõÊýÁУ¬ÔòÊýÁÐ?an?Ò²Ò»¶¨ÊǵݼõÊýÁУ» ¢ÛÊýÁÐ?bn?¿ÉÄÜÊÇÏȼõºóÔöÊýÁУ»

¢ÜÈôbk?am?k?1?C(k?1,2,...,m)£¬CΪ³£Êý£¬Ôòai?bi(i?1,2,...,m)¡£ ÆäÖУ¬ÕýÈ·ÅжϵÄÐòºÅÊÇ£¨ £©

£¨A£©¢Ù¢Û £¨B£©¢Ú¢Ü £¨C£©¢Ú¢Û £¨D£©¢Ú

¶þ¡¢Ìî¿ÕÌ⣺±¾´óÌâ¹²6СÌ⣬ÿСÌâ5·Ö£¬¹²30·Ö¡£°Ñ´ð°¸ÌîÔÚÌâÖкáÏßÉÏ¡£ 11. ²»µÈʽ2x2?x?0µÄ½â¼¯Îª________________¡£

12. ÔÚ¡÷ABCÖУ¬b?2,c?3,A?150?£¬Ôòa=___________¡£

13. ijУ¸ßÒ»Äê¼¶Èý¸ö°à¹²ÓÐѧÉú120Ãû£¬ÕâÈý¸ö°àµÄÄС¢Å®ÉúÈËÊýÈçÏÂ±í¡£

ÒÑÖªÔÚÈ«Ä꼶ѧÉúÖÐËæ»ú³éÈ¡1ÈË£¬³éµ½¶þ°àÅ®ÉúµÄ¸ÅÂÊÊÇ0.2¡£Ôòx=_____£»ÏÖÓ÷ֲã³éÑùµÄ·½·¨ÔÚÈ«Äê¼¶³éÈ¡30ÃûѧÉú£¬ÔòÓ¦ÔÚÈý°à³éÈ¡µÄѧÉúÈËÊýΪ____________¡£

Å®ÉúÈËÊý ÄÐÉúÈËÊý

Ò»°à 20 20

¶þ°à x 20

Èý°à y z

14. ¼×¡¢ÒÒÁ½È˸÷²Î¼ÓÁË5´Î²âÊÔ£¬½«ËûÃÇÔÚ¸÷´Î²âÊÔÖеĵ÷ֻæÖƳÉÈçͼËùʾµÄ¾¥Ò¶Í¼¡£ÒÑÖª¼×¡¢ÒÒ¶þÈËµÃ·ÖµÄÆ½¾ùÊýÏàµÈ£¬Ôòm=________£»Òҵ÷ֵķ½²îµÈÓÚ____¡£

15. Éè?an?ÊǵȲîÊýÁУ¬SnΪÆäǰnÏîµÄºÍ¡£Èôa5??3,S3??27£¬Ôòa1?_______£»

ÁªÏµ¿Í·þ£º779662525#qq.com(#Ìæ»»Îª@)