ºÃÎĵµ - רҵÎÄÊéд×÷·¶ÎÄ·þÎñ×ÊÁÏ·ÖÏíÍøÕ¾

¶Ô¿Úµ¥ÕÐ-Ñγǵڶþ´Îµ÷ÑС¶Êýѧ¡·¿¼ÊÔÊÔ¾í¼°´ð°¸

ÓÉ ÌìÏ ·ÖÏí ʱ¼ä£º ¼ÓÈëÊÕ²Ø ÎÒҪͶ¸å µãÔÞ

2Tn? ?1?21?0?22?1?22?LL ?(n?3)?2n?1?(n?2)?2n ¢Ú

¢Ù£­¢Ú µÃ?Tn??1?(n?2)?2?(2?2?2?L?2n123n?1)

n¡àTn?(n?3)?2?3 ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­14·Ö

21.½â£º¢ÅÓÉÌâÒâµÃ£ºy?x?20,(1?x?160,x?Z)£» ¡­¡­¡­¡­¡­¡­3·Ö ¢ÆÓÉÌâÒâµÃ£º

P?(x?20)(1000?3x)??3x2?940x?20000,(1?x?160,x?Z)£»¡­¡­¡­¡­¡­¡­6·Ö

¢ÇÓÉÌâÒâµÃ£ºW?(?3x?940x?20000)?20?1000?310x??3(x?105)?33075

22?µ±x?105ʱ£¬Wmax?33075£¬

?´æ·Å105Ìì³öÊÛ¿É»ñµÃ×î´óÀûÈó£¬Îª33075Ôª. ¡­¡­¡­¡­¡­¡­10·Ö

22. ½â£ºÉèÿÌì°²ÅÅÉú²ú¼×¡¢ÒÒÁ½ÖÖÐÂÐͲúÆ·¸÷x¡¢y¼þ,ÀûÈóΪzÍòÔª.

maxz?7x?10y

?3x?5y?44?3x?5y?44?2x?6y?48?x?3y?24?????4x?4y?48??x?y?12 ?x,y?3?x,y?3?????x,y?N??x,y?N?×÷³ö¿ÉÐÐÇøÓò£¨ÈçͼËùʾ£©

Ä¿±êº¯Êý¿É»¯Îªy??×÷³öÖ±Ïßl0:y??7zx?£¬ 10107x£¬¾­¹ýƽÒÆÔÚAµã³öÈ¡µÃ×î´óÖµ. 10?3x?5y?44?x?8¼´A(8,4) ???x?y?12y?4??ËùÒÔÿÌìÓ¦°²ÅÅÉú²ú¼×¡¢ÒÒÖÖÐÂÐͲúÆ·¸÷8¡¢4¼þʱ£¬¼È±£Ö¤Íê³ÉÉú²ú¼Æ»®£¬ÓÖÄÜΪÆóÒµ´´Ôì×î´óµÄЧÒæ.

?3222a???22?22?22?32??2?xy?23. ½â£º£¨1£©ÒÀÌâÒâÉèÍÖÔ²·½³ÌΪ£º2?2?1?a?b?0?£¬Ôò?2c???2?????2?? ab??????a2?b2?c2????x2?a?2?y2?1¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­4·Ö ¡à?¡àËùÇóÍÖÔ²·½³ÌΪ2??b?1

(2)ÓÉÌâÒâÖªÔ²¹ý(2,0),(0,1),(0,?1)Èýµã£¬ÉèÔ²E·½³ÌΪx2?y2?Dx?Ey?F?0?2D???2?2D?F?0?2?2?Ôò?1?E?F?0½âµÃ?E?0£¬?Ô²E·½³ÌΪx2?y2-x-1?0???8·Ö2?1?E?F?0?F??1???½â·¨¶þ£ºÒÀÌâÒâ¿ÉÉèÔ²µÄÔ²ÐÄΪ£¨m,0£©?m?0?,Ôòm2?1?m?2,?m??2?9??y2??ËùÇóÔ²E·½³ÌΪ?x??4?8??

(3)É趯ֱÏßl22,4·½³ÌΪ

?y?x?m?y=x+m£¬ÓÉ?x2Ïû

2??y?1?2yµÃ£º

3x+4mx+2m-2=0£¬¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­10·Ö

2

¡ßÖ±ÏßÓëÍÖÔ²ÓÐÁ½¸ö½»µã£¬¡à¡÷>0¼´m<3£¬

22

42m2?2, ÉèA£¨x1£¬y1£©¡¢B£¨x2£¬y2£©¡àx1?x2??m,x1x2?33m423?m£¬ÓÖÔ­µãOµ½Ö±Ïßy=x+mµÄ¾àÀëd?´úÈëÏÒ³¤¹«Ê½ µÃAB? 32?S?AOB2m114229?23?224?ABd??3?m??3m?m???m???223332?42?¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­12·Ö ¡ß

633ʱ£¬ ?3£¬¡àm2=£¬¼´m??2226¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­14·Ö 2SVAOB×î´ó£¬´ËʱֱÏßl·½³ÌΪy?x??y?x?m?½â·¨¶þ£ºÉ趯ֱÏßl·½³ÌΪy=x+m£¬ÓÉ?x2ÏûxµÃ£º

2??y?1?23y-2my+m-2=0£¬¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­10·Ö

2

¡ßÖ±ÏßÓëÍÖÔ²ÓÐÁ½¸ö½»µã£¬¡à¡÷>0¼´m<3£¬

2

2

2m2?2 ÉèA£¨x1£¬y1£©¡¢B£¨x2£¬y2£©¡ày1?y2?m,y1y2?£¬

3342m2?288m2¡ày1?y2?£¬ÓÖ¡ßÖ±ÏßlÓëxÖá½»Óڵ㣨-m£¬0£©£¬ m?4???9339¡àSVAOB

188m21828m4¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­12·Ö ??m??m?2392392618?3?33???m2???2£¬¡ß?3£¬¡àm2=£¬¼´m??ʱ£¬

229?2?22SVAOB×î´ó£¬´ËʱֱÏßl·½³ÌΪy?x?.

6¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­14·Ö 2

¶Ô¿Úµ¥ÕÐ-Ñγǵڶþ´Îµ÷ÑС¶Êýѧ¡·¿¼ÊÔÊÔ¾í¼°´ð°¸

2Tn??1?21?0?22?1?22?LL?(n?3)?2n?1?(n?2)?2n¢Ú¢Ù£­¢ÚµÃ?Tn??1?(n?2)?2?(2?2?2?L?2n123n?1)n¡àTn?(n?3)?2?3¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­14·Ö21.½â£º¢ÅÓÉÌâÒâµÃ£ºy?x?20,(1?x?160,x?Z)£»
ÍƼö¶È£º
µã»÷ÏÂÔØÎĵµÎĵµÎªdoc¸ñʽ
9jty01f5cp4yj364q360565jb3urvy0110c
ÁìÈ¡¸£Àû

΢ÐÅɨÂëÁìÈ¡¸£Àû

΢ÐÅɨÂë·ÖÏí