·¢²¼Ê±¼ä : ÐÇÆÚ¶þ ÎÄÕÂÄþÏÄÒø´¨Ò»ÖÐ2020½ì¸ßÈýµÚÁù´ÎÔ¿¼Êýѧ(ÎÄ)ÊÔÌâ(º¬´ð°¸)¸üÐÂÍê±Ï¿ªÊ¼ÔĶÁ
uuuuruuur333QOM?ON??£¬??m2?2???£¬½âµÃm??1£¬
222¹Ê´æÔÚÖ±Ïßl£ºy?2x?1Âú×ãÌõ¼þ 2¡¾µã¾¦¡¿±¾Ì⿼²éÍÖÔ²µÄ±ê×¼·½³Ì£¬Ô²µÄ¼¸ºÎÐÔÖÊ£¬Ö±ÏßÓëÍÖÔ²µÄλÖùØϵ×ÛºÏÓ¦Óã¬É漰Τ´ï¶¨ÀíÇóÖ±ÏßÓëÍÖÔ²µÄ½»µã£¬ÏòÁ¿ÊýÁ¿»ýµÄ×ø±êÔËË㣬ÊôÓÚÖеµÌâ. 21.ÒÑÖªº¯Êýf?x??lnx?a?x?1?,a?R. £¨1£©µ±a?1ʱ£¬Çóº¯Êýf?x?µÄµ¥µ÷Çø¼ä£» £¨2£©µ±x?1ʱ£¬f?x??lnxºã³ÉÁ¢£¬ÇóaµÄÈ¡Öµ·¶Î§. x?1?1?2??¡¾´ð°¸¡¿£¨1£©f?x?µÄµ¥µ÷µÝÔöÇø¼äΪ?0,1?£¬µÝ¼õÇø¼äΪ?1,???£»£¨2£©?,???. ¡¾½âÎö¡¿
¡¾Ïê½â¡¿£¨1£©f?x?µÄ¶¨ÒåÓòΪ?0,???£¬a?1ʱ£¬f??x??Áîf??x??0?0?x?1£¬¡àf?x?1?x x?0,1?Éϵ¥µ÷µÝÔö£»
Áîf??x??0?x?1£¬¡àf?x?ÔÚ?1,???Éϵ¥µ÷µÝ¼õ ×ÛÉÏ£¬f?x?µÄµ¥µ÷µÝÔöÇø¼äΪ?0,1?£¬µÝ¼õÇø¼äΪ?1,???.
xlnx?ax2?1lnx£¨2£©f?x??£¬ ?x?1x?1Áîg?x??xlnx?ax?1?x?1?£¬g??x??lnx?1?2ax£¬
2????Áîh?x??g??x??lnx?1?2ax£¬Ôòh??x??1?2ax x£¨1£©Èôa?0,h??x??0£¬g??x?ÔÚ1,???ÉÏΪÔöº¯Êý£¬g??x??g??1??1?2a?0 ¡àg?x?ÔÚ1,???ÉÏΪÔöº¯Êý£¬g?x??g?1??0£¬¼´g?x??0. ´Ó¶øf?x????lnx?0£¬²»·ûºÏÌâÒâ. x?1?1??1?1??x?1,hx?0gx£¬µ±£¬??ÔÚ?1,??ʱ£¬???Éϵ¥µ÷µÝÔö£¬
2?2a??2a?£¨2£©Èô0?a?
g??x??g??1??1?2a?0£¬
ͬ¢ñ£©£¬ËùÒÔ²»·ûºÏÌâÒâ £¨3£©µ±a?1ʱ£¬h??x??0ÔÚ?1,???ÉϺã³ÉÁ¢. 2¡àg??x?ÔÚ1,???µÝ¼õ£¬g??x??g??1??1?2a?0. ´Ó¶øg?x?ÔÚ1,???Éϵݼõ£¬¡àg?x??g?1??0£¬¼´f?x??½áÉÏËùÊö£¬aµÄÈ¡Öµ·¶Î§ÊÇ?,???.
??lnx?0. x?1?1?2??£¨¶þ£©Ñ¡¿¼Ì⣺¹²10·Ö.Ç뿼ÉúÔÚµÚ22¡¢23Á½ÌâÖÐÈÎÑ¡Ò»Ìâ×ö´ð£¬Èç¹û¶à×ö.Ôò°´Ëù×öµÄµÚÒ»Ìâ¼Ç·Ö.
22.ÔÚƽÃæÖ±½Ç×ø±êϵxOyÖУ¬¹ýµãP(1,0)×÷Çãб½ÇΪ
?µÄÖ±Ïßl£¬ÒÔÔµãOΪ¼«µã£¬xÖá·Ç6¸º°ëÖáΪ¼«ÖὨÁ¢¼«×ø±êϵ£¬ÇúÏßC1µÄ¼«×ø±ê·½³ÌΪ??1£¬½«ÇúÏßC1Éϸ÷µãµÄºá×ø±êÉ쳤ΪÔÀ´µÄ2±¶£¬×Ý×ø±ê²»±ä£¬µÃµ½ÇúÏßC2£¬Ö±ÏßlÓëÇúÏßC2½»ÓÚ²»Í¬µÄÁ½µãM,N. £¨1£©ÇóÖ±ÏßlµÄ²ÎÊý·½³ÌºÍÇúÏßC2µÄÆÕͨ·½³Ì£»
11?£¨2£©ÇóµÄÖµ. PMPN?3x?1?t??x22(tΪ²ÎÊý£©¡¾´ð°¸¡¿£¨1£©Ö±ÏßlµÄ²ÎÊý·½³ÌΪ?£¬ÇúÏßC2µÄÆÕͨ·½³ÌΪ?y2?1£»
4?y?1t?2?£¨2£©
26 3¡¾½âÎö¡¿ ¡¾·ÖÎö¡¿
£¨1£©¸ù¾ÝÖ±Ïß²ÎÊý·½³ÌµÄ֪ʶÇóµÃÖ±ÏßlµÄ²ÎÊý·½³Ì£¬½«C1µÄ¼«×ø±ê·½³Ìת»¯ÎªÖ±½Ç×ø±ê·½³Ì£¬È»ºóͨ¹ýͼÏñ±ä»»µÄ֪ʶÇóµÃC2µÄÆÕͨ·½³Ì.
£¨2£©½«Ö±ÏßlµÄ²ÎÊý·½³Ì´úÈëÇúÏßC2µÄÆÕͨ·½³Ì£¬»¯¼òºóд³öΤ´ï¶¨Àí£¬¸ù¾ÝÖ±Ïß²ÎÊýµÄ¼¸
11?ºÎÒâÒ壬ÇóµÃµÄÖµ. PMPN?3x?1?t??2(tΪ²ÎÊý£©¡¾Ïê½â¡¿(1)Ö±ÏßlµÄ²ÎÊý·½³ÌΪ?£¬ ?y?1t?2?222ÓÉ??1Á½±ßƽ·½µÃ??1£¬ËùÒÔÇúÏßC1µÄÖ±½Ç×ø±ê·½³Ìʽx?y?1,
x2x22ÇúÏßC2µÄ·½³ÌΪ()?y?1,¼´?y2?1.
24?3x?1?t??2(tΪ²ÎÊý£©(2)Ö±ÏßlµÄ²ÎÊý·½³ÌΪ?£¬´úÈëÇúÏßC2µÄ·½³ÌµÃ£º ?y?1t?2?7t2?43t?12?0,
ÉèM,N¶ÔÓ¦µÃ²ÎÊý·Ö±ðΪt1,t2,Ôòt1?t2??4312,t1t2??. 77t1?t2t1?t2(t1?t2)2?4t1t2261111????????. PMPNt1t2t1t2t1t2t1t23¡¾µã¾¦¡¿±¾Ð¡ÌâÖ÷Òª¿¼²éÖ±ÏߵIJÎÊý·½³Ì£¬¿¼²é¼«×ø±ê·½³Ìת»¯ÎªÖ±½Ç×ø±ê·½³Ì£¬¿¼²éͼÏñ±ä»»£¬¿¼²éÖ±Ïß²ÎÊýµÄ¼¸ºÎÒâÒ壬¿¼²éÔËËãÇó½âÄÜÁ¦£¬ÊôÓÚÖеµÌâ. 23. Ñ¡ÐÞ4¡ª5£º²»µÈʽѡ½² É躯Êýf(x)?3x?1?ax?3. £¨1£©Èôa=1£¬½â²»µÈʽf(x)?5£»
£¨2£©Èôº¯Êýf(x)ÓÐ×îСֵ£¬ÇóʵÊýaµÄÈ¡Öµ·¶Î§£® ¡¾´ð°¸¡¿£¨1£©{x|?¡¾½âÎö¡¿
ÊÔÌâ·ÖÎö£º£¨1£©¾ø¶ÔÖµ²»µÈʽ3x?1?x?3?5£¬¸ù¾Ý¾ø¶ÔÖµµÄ¶¨Òå·ÖÀàÌÖÂÛÈ¥¾ø¶ÔÖµ·ûºÅ£»
13?x?}.£»£¨2£©?3?a?3 24
1(3?a)x?2,(x?)3£¨2£©º¯Êýf(x)?3x?1?ax?3?{ÊǷֶκ¯Êý£¬ËüÒª´æÔÚ×îСֵ£¬Ôò
1(a?3)x?4.(x?)3Á½²¿·ÖÓ¦Âú×ã×ó±ßÊǼõº¯Êý£¬ÓÒ±ßÊÇÔöº¯Êý£® ÊÔÌâ½âÎö£º£¨¢ñ£©a?1ʱ£¬f(x)?3x?1?x?3£®
113ʱ£¬f(x)?5¿É»¯Îª3x?1?x?3?5£¬½âÖ®µÃ?x?£» 334111µ±x?ʱ£¬f(x)?5¿É»¯Îª?3x?1?x?3?5£¬½âÖ®µÃ??x?£®
32313×ÛÉϿɵã¬Ô²»µÈʽµÄ½â¼¯Îª{x|??x?}.5·Ö
24µ±x?1(3?a)x?2,(x?)3 £¨¢ò£©f(x)?3x?1?ax?3?{1(a?3)x?4.(x?)3º¯Êýf(x)ÓÐ×îСֵµÄ³äÒªÌõ¼þΪ{3?a?0,¼´?3?a?310·Ö
a?3?0,¿¼µã£º½â¾ø¶ÔÖµ²»µÈʽ£¬·Ö¶Îº¯ÊýµÄµ¥µ÷ÐÔÓë×îÖµ£®