£¨2012•±±³½Çøһģ£©ÒÑÖª¶þ´Îº¯Êýy=2x2+2mx+m-1£®
£¨1£©¢ÙÈôº¯ÊýͼÏóµÄ¶Ô³ÆÖáΪֱÏßx=-1£¬ÇómµÄÖµ£»¢ÚÈôx¡Ý-1ʱ£¬º¯ÊýÖµyËæxµÄÔö´ó¶øÔö´ó£¬ÇómµÄÈ¡Öµ·¶Î§£»
£¨2£©ÉèÅ×ÎïÏßÓëxÖáµÄÒ»¸ö½»µãΪ£¨x1£¬0£©£¬¢Ùµ±x1=-2ʱ£¬ÇómµÄÖµ£»¢Úµ±-3£¼x1£¼-2ʱ£¬ÇómµÄÈ¡Öµ·¶Î§£»
£¨3£©¢ÙÈôº¯ÊýµÄ×îСֵΪ-1£¬ÇómµÄÖµ£»¢Úµ±2¡Üx¡Ü4ʱ£¬º¯ÊýµÄ×îСֵΪ-1£¬ÇómµÄÖµ£®
·ÖÎö£º£¨1£©¢Ù¸ù¾Ý¶Ô³ÆÖáµÄ¹«Ê½x=-
b
2a
£¬¼´¿ÉµÃµ½Ò»¸ö¹ØÓÚmµÄ·½³Ì£¬ÇóµÃmµÄÖµ£»
¢Úx¡Ý-1ʱ£¬º¯ÊýÖµyËæxµÄÔö´ó¶øÔö´ó£¬¼´-1ÔÚ¶Ô³ÆÖáÉÏ£¬»ò¶Ô³ÆÖáµÄÓҲ࣬¼´-
b
2a
¡Ü-1£¬¼´¿ÉµÃµ½¹ØÓÚmµÄ²»µÈʽ£¬´Ó¶øÇóµÃmµÄ·¶Î§£»
£¨2£©¢Ù£¨-2£¬0£©ÊÇÅ×ÎïÏßÉϵÄÒ»µã£¬´úÈ뺯ÊýµÄ½âÎöʽ£¬¼´¿ÉÇóµÃmµÄÖµ£»
¢Ú¸ù¾Ý¸ùµÄÅбðʽ¿ÉÒԵõ½Å×ÎïÏßÓëxÖáÒ»¶¨ÓÐÁ½¸ö²»Í¬µÄ½»µã£¬ÁíÒ»¸ö½»µã²»ÔÚ-3£¼x1£¼-2µÄ·¶Î§ÄÚ£¬Òò¶øÔÚÅ×ÎïÏߵĽâÎöʽÖУ¬µ±x=-3ºÍ-2ʱ£¬Á½¸öº¯ÊýÖµÒ»¶¨ÒìºÅ£¬¾Ý´Ë¼´¿ÉÇóµÃmµÄ·¶Î§£»
£¨3£©¢Ùº¯ÊýµÄ×îСֵΪ-1£¬¼´º¯ÊýµÄ¶¥µãµÄ×Ý×ø±êÊÇ-1£¬¼´¿ÉÁз½³ÌÇóµÃmµÄÖµ£»
¢Ú·Ö×îСֵÊǺ¯ÊýµÄ¶¥µãµÄ×Ý×ø±ê£¬ºÍ²»ÊÇ×Ý×ø±êÁ½ÖÖÇé¿ö½øÐÐÌÖÂÛ£¬µ±²»ÊǶ¥µãµÄ×Ý×ø±êʱ£¬2¡Üx¡Ü4ÔòÒ»¶¨ÔÚ¶Ô³ÆÖáµÄͬһ²à£¬Ôòº¯ÊýÒ»¶¨¾­¹ý£¨2£¬-1£©»ò£¨4£¬-1£©£¬´úÈ뺯Êý½âÎöʽ¼´¿ÉÇó½â£®
½â´ð£º½â£º£¨1£©¢ÙÓÉ-
2m
2¡Á2
=-1
£¬µÃm=2£»
¢ÚÓÉÌâÒ⣬µÃ-
2m
2¡Á2
¡Ü-1£¬µÃm¡Ý2£®

£¨2£©¢Ù°Ñx1=-2´úÈ룬µÃ0=2£¨-2£©2+2m£¨-2£©+m-1£¬
½âµÃm=
7
3
£»                                       
¢Ú¡÷=£¨2m£©2-8£¨m-1£©=4£¨m-1£©2+4£¾0£®
ËùÒÔ¶ÔÈÎÒâµÄmÖµ£¬Å×ÎïÏßÓëxÖᶼÓÐÁ½¸ö½»µã£®
ÉèÓëxÖáµÄÁíÒ»¸ö½»µãµÄºá×ø±êΪx2£¬Ôò|x1-x2|=
4(m-1)+4
2
¡Ý
2
2
=1
£¬
¡àµ±ÓÉ-3£¼x1£¼-2ʱ£¬x2²»ÔÚÕâ¸ö·¶Î§ÄÚ£®
ÓÉ-3£¼x1£¼-2£¬µÃ
2(-2)2+2m(-2)+m-1£¼0
2(-3)2+2m(-3)+m-1£¾0.

»ò
2(-2)2+2m(-2)+m-1£¾0
2(-3)2+2m(-3)+m-1£¼0.
£¬½âµÃ
m£¾
7
3
m£¼
17
5
»ò
m£¼
7
3
m£¾
17
5
£¨Î޽⣩£®
¡à
7
3
£¼m£¼
17
5
£®

£¨3£©¢Ù
4¡Á2(m-1)-(2m)2
4¡Á2
=-1£¬
½âµÃ£ºm=0£¬m=2£»
¢Úµ«×îСֵΪ-1£¬ÊÇÕû¸öº¯ÊýµÄ×îСֵʱ£¬¼´¢ÙµÄÇé¿ö£¬ÇóµÃm=0»ò2£¬µ±m=0ʱ£¬Ó¦¸ÃÓе±x=0ʱ£¬ÓÖ×îСֵÊÇ-1£¬¹Ê²»ºÏÌâÒ⣻
µ±m=2ʱ£¬ÔòÅ×ÎïÏߵĽâÎöʽÊÇ£ºy=2x2+4x+1£¬Ôòµ±x=-1ÊÇ£¬ÓÖ×îСֵÊÇ-1£»
Òò¶ø2¡Üx¡Ü4Ó¦¸ÃÊǶԳÆÖáÒ»²àµÄµã£¬
¶Ô³ÆÖáÊÇx=-
m
2
£¬µ±2¡Üx¡Ü4¶¼ÔÚ¶Ô³ÆÖáµÄÓҲ࣬ÔòÒ»¶¨¹ýµã£¨2£¬-1£©£¬´úÈ뺯ÊýµÄ½âÎöʽµÃ£ºm=-
8
5
£»
µ±2¡Üx¡Ü4¶¼ÔÚ¶Ô³ÆÖáµÄ×ó²à£¬ÔòÒ»¶¨¹ýµã£¨4£¬-1£©£¬´úÈ뺯ÊýµÄ½âÎöʽµÃ£º32+8m+3=-1£¬½âµÃ£ºm=-
9
2
£¬£¨Óëµ±2¡Üx¡Ü4¶¼ÔÚ¶Ô³ÆÖáµÄÓÒ²àÏàì¶Ü£¬¹ÊÉáÈ¥£©£®
×ÜÖ®£¬m=-
8
5
£®
µãÆÀ£º±¾Ì⿼²éÁ˶þ´Îº¯ÊýµÄÐÔÖÊ£¬ÒÔ¼°¶¥µã×ø±ê£¬ÕýÈ·ÀûÓÃÊýÐνáºÏµÄ˼ÏëÊǽâÌâµÄ¹Ø¼ü£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

£¨2012•±±³½Çøһģ£©ÏÂÁÐͼÐΣ¬¼È¿ÉÒÔ¿´×÷ÊÇÖÐÐĶԳÆͼÐÎÓÖ¿ÉÒÔ¿´×÷ÊÇÖá¶Ô³ÆͼÐεÄÊÇ£¨¡¡¡¡£©

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

£¨2012•±±³½Çøһģ£©½òËþÊÇÌì½òÊеÄ×î¸ß½¨Öþ£¬½òËþ¹æ»®µØÉϽ¨ÖþÃæ»ý205000ƽ·½Ã×£®Êý×Ö205000ÓÿÆѧ¼ÇÊý·¨¿É±íʾΪ£¨¡¡¡¡£©

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

£¨2012•±±³½Çøһģ£©Èçͼ£¬¡÷ABCÖУ¬¡ÏA=50¡ã£¬µãE¡¢FÔÚAB¡¢ACÉÏ£¬ÑØEFÏòÄÚÕÛµþ¡÷AEF£¬µÃ¡÷DEF£¬ÔòͼÖСÏ1+¡Ï2µÈÓÚ£¨¡¡¡¡£©

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

£¨2012•±±³½Çøһģ£©Ò»¸ù¸Ö¹ÜÈçͼËùʾ£¬ËüµÄÈýÊÓͼΪ£¨¡¡¡¡£©

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

£¨2012•±±³½Çøһģ£©ÏÂÃæÊǼס¢ÒÒÁ½ÈË10´ÎÉä»÷³É¼¨£¨»·Êý£©µÄÌõÐÎͳ¼Æͼ£¬ÔòÏÂÁйØϵʽÕýÈ·µÄÊÇ£¨¡¡¡¡£©

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸