18.(±¾Ð¡ÌâÂú·Ö13·Ö£©ÒÑÖª?bn?ΪÕýÏîµÈ±ÈÊýÁУ¬b2?2,b4?8,ÇÒÊýÁÐ?an?Âú×㣺
anbn?1?log2bn.
£¨I£©Çó?an?ºÍ?bn?µÄͨÏʽ£»
n£¨-1£©??Tnºã³ÉÁ¢?µÄÈ¡Öµ·¶Î§. £¨II£©ÇóÊýÁÐ?an?µÄÇ°nÏîºÍTn£¬²¢ÇóʹµÃ
x2y219.£¨±¾Ð¡ÌâÂú·Ö14·Ö£©ÒÑÖªÍÖÔ²2?2?1(a?b?0)×󶥵ãΪM£¬É϶¥µãΪN,Ö±ÏßMNµÄ
abбÂÊΪ
1. 2£¨¢ñ£©ÇóÍÖÔ²µÄÀëÐÄÂÊ£»
£¨¢ò£©Ö±Ïßl:y?1x?m(m?0)ÓëÍÖÔ²½»ÓÚA,CÁ½µã,ÓëyÖá½»ÓÚµãP,ÒÔÏ߶ÎACΪ¶Ô½ÇÏß×÷210. 2Õý·½ÐÎABCD,ÈôBP?£¨i£©ÇóÍÖÔ²·½³Ì£»
£¨ii£©ÈôµãEÔÚÖ±ÏßMNÉÏ,ÇÒÂú×ã?EAC?90?,ÇóʹµÃEC×ʱ,Ö±ÏßACµÄ·½³Ì.
20.£¨±¾Ð¡ÌâÂú·Ö13·Ö£©ÒÑÖªº¯Êýf(x)?2lnx?ax2(a?R)£® £¨1£©µ±a?1ʱ£¬Çóº¯Êýf(x)µÄ¼«Öµ£»
£¨2£©Èôº¯Êýf(x)µÄͼÏóʼÖÕÔÚº¯Êýg(x)?2x3ͼÏóµÄÏ·½£¬ÇóʵÊýaµÄÈ¡Öµ·¶Î§£®
Àí¿ÆÊýѧ²Î¿¼´ð°¸¼°ÆÀ·Ö±ê×¼
ÌâºÅ ´ð°¸
1 C 2 A 3 C 4 B 5 B 6 D 7 C 8 A 9.2 10. .3 11.1 12.-1 13.22?2 14.-1 15.¡¾´ð°¸¡¿£¨1£©f?x?max?6£¬f?x?min?3£»£¨2£©C=?£® 2¡¾½âÎö¡¿£¨1£©f?x??6sin?2x?????¡¤¡¤¡¤¡¤¡¤¡¤3·Ö ?¡¤6?¡ßf?x?ÔÚ?0,????????ÉÏ¡ü£¬¡¤¡¤¡¤¡¤¡¤¡¤6·Ö ??,?ÉÏ¡ý£¬¡àf?x?max?6£¬f?x?min?3¡¤6?64??£¨2£©¡÷ADCÖУ¬ADACBDBC£¬¡÷BDCÖУ¬£¬ ??Csin?ADCCsin?BDCsinsin22¡ßsin?ADC?sin?BDC£¬AC?6£¬BC?3£¬ ¡ßAD?2BD¡¤¡¤¡¤¡¤¡¤¡¤¡¤9·Ö
¡÷BCDÖУ¬BD2?17?122cos¡÷ACDÖУ¬AD2?44?242cosC2??£¬C=¡¤¡¤¡¤¡¤¡¤¡¤¡¤12·Ö 222C£¬ 2CC?68?482cos£¬ 22¡àcos16.¡¾´ð°¸¡¿£¨1£©¼û½âÎö£»£¨2£©h?6£® 2¡¾½âÎö¡¿£¨1£©Ö¤Ã÷£ºÈ¡ABÖеãO£¬Á¬½ÓCO£¬DO£¬DA£®
¡ß¡÷ABCΪµÈ±ßÈý½ÇÐΣ¬¡àCO?AB£¬¡¤¡¤¡¤¡¤¡¤¡¤¡¤1·Ö
¡ßËıßÐÎABCDΪÁâÐΣ¬?DBA?60£¬¡à¡÷DABΪµÈ±ßÈý½ÇÐΣ¬ ¡àDO?AB£¬¡¤¡¤¡¤¡¤¡¤¡¤¡¤2·Ö ÓÖ¡ßCODO?O£¬
¡àAB?ÃæDOC£¬¡¤¡¤¡¤¡¤¡¤¡¤¡¤4·Ö ¡ßDC?ÃæDOC£¬ ¡àAB?CD£®¡¤¡¤¡¤¡¤¡¤¡¤¡¤6·Ö
£¨2£©¡ßÃæABDE?ÃæABC£¬CO?AB£¬ÃæABDE¡àCO?ÃæABDE£¬ ¡ßOD?ÃæABDE£¬ ¡àCO?OD£®
¡ßOD?OC?3£¬¡¤¡¤¡¤¡¤¡¤¡¤¡¤7·Ö
ÃæABC?AB£¬CO?ÃæABC£¬
ÔÚRt¡÷CODÖУ¬CD?OD?OC?6£¬ ÓÉ£¨1£©µÃAB?CD£¬ ÒòΪ
22ED¡ÎAB£¬ED?DC£¬
11?CD?ED??2?6?6£¬¡¤¡¤¡¤¡¤¡¤¡¤¡¤9·Ö 221?2?2?sin120??3£¬¡¤¡¤¡¤¡¤¡¤¡¤¡¤10·Ö 2ÇÒS¡÷CDE?¡ßS¡÷BDE?Éèµã
Bµ½ÃæCDEµÄ¾àÀëΪh£®
11?S¡÷CDE?h??S¡÷BDE?CO£® 33¡ßVB?CDE?VC?BDE£¬¼´¼´?6?h?131?3?3£¬ 3¡àh?6£®¡¤¡¤¡¤¡¤¡¤¡¤¡¤12·Ö 217.½âÎö£º£¨1£©2?2ÁÐÁª±í£º
¶ÔÉÌÆ·ÂúÒâ ¶ÔÉÌÆ·²»ÂúÒâ ºÏ¼Æ ¶Ô¿ìµÝÂúÒâ ¶Ô¿ìµÝ²»ÂúÒâ ºÏ¼Æ 80 60 140 40 120 20 80 60 200 200?(80?20?40?60)2100K???1.59£¬
140?60?120?80632ÓÉÓÚ1.59?6.635£¬ËùÒÔûÓÐ99%µÄ°ÑÎÕÈÏΪ¡°Íø¹ºÕ߶ÔÉÌÆ·ÂúÒâÓë¶Ô¿ìµÝÂúÒâÖ®¼äÓйØϵ¡±.
£¨2£©¸ù¾ÝÌâÒ⣬³éÈ¡µÄ10´Î½»Ò×ÖУ¬¶ÔÉÌÆ·ºÍ¿ìµÝ¶¼ÂúÒâµÄ½»Ò×ÓÐ4´Î¼ÇΪABCD£¬ÆäÓà6´Î²»ÊǶ¼ÂúÒâµÄ½»Ò×¼ÇΪ123456.ÄÇô³éÈ¡2´Î½»Ò×Ò»¹²ÓÐ45ÖÖ¿ÉÄÜ£ºAB£¬AC£¬AD£¬A1£¬A2£¬A3£¬A4£¬A5£¬
A6£¬BC£¬BD£¬B1£¬B2£¬¡¡56.ÆäÖÐ2´Î½»Ò׶ÔÉÌÆ·ºÍ¿ìµÝ²»ÊǶ¼ÂúÒâµÄÓÐ15ÖÖ£º12£¬13£¬¡¡£¬
45?152?. 56.ËùÒÔ£¬ÔÚ³éÈ¡µÄ2´Î½»Ò×ÖУ¬ÖÁÉÙÒ»´Î¶ÔÉÌÆ·ºÍ¿ìµÝ¶¼ÂúÒâµÄ¸ÅÂÊÊÇP?453
18.½â£º£¨I£©
?bn?ΪÕýÏîµÈ±ÈÊýÁУ¬É蹫±ÈΪq£¬?q2?b4?4?q?2
2b?bn?2n?1
ÓÖ
1an2n?1?log22n?1?1?n?an?n()n?1
21?n()n?1¢Ù
211?(n?1)()n?1?n()n¢Ú
22111?()n?1?n()n?2?(n?2)()n 2221111£¨II£©Tn?()0?2()1?3()2?4()3?222211111Tn?()1?2()2?3()3?4()4?2222211111¢Ù-¢ÚµÃTn?()0?()1?()2?()3?22222Tn?4?n?2 2n?1