£¨2009•ôë½­ÏØ£©Èçͼ£¬ÒÑÖªÅ×ÎïÏßy=a£¨x-1£©2+3£¨a¡Ù0£©¾­¹ýµãA£¨-2£¬0£©£¬Å×ÎïÏߵĶ¥µãΪD£¬¹ýO×÷ÉäÏßOM¡ÎAD£®¹ý¶¥µãƽÐÐÓÚxÖáµÄÖ±Ïß½»ÉäÏßOMÓÚµãC£¬BÔÚxÖáÕý°ëÖáÉÏ£¬Á¬½ÓBC£®
£¨1£©Çó¸ÃÅ×ÎïÏߵĽâÎöʽ£»
£¨2£©Èô¶¯µãP´ÓµãO³ö·¢£¬ÒÔÿÃë1¸ö³¤¶Èµ¥Î»µÄËÙ¶ÈÑØÉäÏßOMÔ˶¯£¬ÉèµãPÔ˶¯µÄʱ¼äΪt£¨s£©£®Îʵ±tΪºÎֵʱ£¬ËıßÐÎDAOP·Ö±ðΪƽÐÐËıßÐΣ¬Ö±½ÇÌÝÐΣ¬µÈÑüÌÝÐΣ¿
£¨3£©ÈôOC=OB£¬¶¯µãPºÍ¶¯µãQ·Ö±ð´ÓµãOºÍµãBͬʱ³ö·¢£¬·Ö±ðÒÔÿÃë1¸ö³¤¶Èµ¥Î»ºÍ2¸ö³¤¶Èµ¥Î»µÄËÙ¶ÈÑØOCºÍBOÔ˶¯£¬µ±ÆäÖÐÒ»¸öµãÍ£Ö¹Ô˶¯Ê±ÁíÒ»¸öµãÒ²Ëæֹ֮ͣÔ˶¯£®ÉèËüÃǵÄÔ˶¯µÄʱ¼äΪt£¨s£©£¬Á¬½ÓPQ£¬µ±tΪºÎֵʱ£¬ËıßÐÎBCPQµÄÃæ»ý×îС£¿²¢Çó³ö×îСֵ¼°´ËʱPQµÄ³¤£®

¡¾´ð°¸¡¿·ÖÎö£º£¨1£©½«AµÄ×ø±ê´úÈëÅ×ÎïÏßy=a£¨x-1£©2+3£¨a¡Ù0£©¿ÉµÃaµÄÖµ£¬¼´¿ÉµÃµ½Å×ÎïÏߵĽâÎöʽ£»
£¨2£©Ò×µÃDµÄ×ø±ê£¬¹ýD×÷DN¡ÍOBÓÚN£»½ø¶ø¿ÉµÃDN¡¢AN¡¢ADµÄ³¤£¬¸ù¾ÝƽÐÐËıßÐΣ¬Ö±½ÇÌÝÐΣ¬µÈÑüÌÝÐεÄÐÔÖÊ£¬ÓÃt½«ÆäÖеĹØϵ±íʾ³öÀ´£¬²¢Çó½â¿ÉµÃ´ð°¸£»
£¨3£©¸ù¾Ý£¨2£©µÄ½áÂÛ£¬Ò׵á÷OCBÊǵȱßÈý½ÇÐΣ¬¿ÉµÃBQ¡¢PE¹ØÓÚtµÄ¹Øϵʽ£¬½«ËıßÐεÄÃæ»ýÓÃt±íʾ³öÀ´£¬½ø¶ø·ÖÎö¿ÉµÃ×îСֵ¼°´ËʱtµÄÖµ£¬½ø¶ø¿ÉÇóµÃPQµÄ³¤£®
½â´ð£º½â£º£¨1£©¡ßÅ×ÎïÏßy=a£¨x-1£©2+3£¨a¡Ù0£©¾­¹ýµãA£¨-2£¬0£©£¬
¡à0=9a+3£¬
¡àa=-£¨1·Ö£©
¡à¶þ´Îº¯ÊýµÄ½âÎöʽΪ£ºy=-x2+x+£»£¨3·Ö£©

£¨2£©¢Ù¡ßDΪÅ×ÎïÏߵĶ¥µã£¬
¡àD£¨1£¬3£©£¬
¹ýD×÷DN¡ÍOBÓÚN£¬ÔòDN=3£¬AN=3£¬
¡àAD==6£¬
¡à¡ÏDAO=60°£®£¨4·Ö£©
¡ßOM¡ÎAD£¬
¢Ùµ±AD=OPʱ£¬ËıßÐÎDAOPÊÇƽÐÐËıßÐΣ¬
¡àOP=6£¬
¡àt=6£¨s£©£®£¨5·Ö£©
¢Úµ±DP¡ÍOMʱ£¬ËıßÐÎDAOPÊÇÖ±½ÇÌÝÐΣ¬
¹ýO×÷OH¡ÍADÓÚH£¬AO=2£¬ÔòAH=1£¨Èç¹ûûÇó³ö¡ÏDAO=60°¿ÉÓÉRt¡÷OHA¡×Rt¡÷DNA£¨ÇóAH=1£©
¡àOP=DH=5£¬t=5£¨s£©£¨6·Ö£©
¢Ûµ±PD=OAʱ£¬ËıßÐÎDAOPÊǵÈÑüÌÝÐΣ¬
Ò×Ö¤£º¡÷AOH¡Õ¡÷DPP¡ä£¬
¡àAH=CP£¬
¡àOP=AD-2AH=6-2=4£¬
¡àt=4£¨s£©×ÛÉÏËùÊö£ºµ±t=6¡¢5¡¢4ʱ£¬¶ÔÓ¦ËıßÐηֱðÊÇƽÐÐËıßÐΡ¢Ö±½ÇÌÝÐΡ¢µÈÑüÌÝÐΣ»£¨7·Ö£©

£¨3£©ÓÉ£¨2£©¼°ÒÑÖª£¬¡ÏCOB=60°£¬OC=OB£¬¡÷OCBÊǵȱßÈý½ÇÐÎÔòOB=OC=AD=6£¬OP=t£¬BQ=2t£¬
¡àOQ=6-2t£¨0£¼t£¼3£©¹ýP×÷PE¡ÍOQÓÚE£¬
ÔòPE=t£¨8·Ö£©
¡àSBCPQ=×6×3×£¨6-2t£©×t
=£¨t-£©2+£¨9·Ö£©
µ±t=ʱ£¬ËıßÐÎBCPQµÄÃæ»ý×îСֵΪ£®£¨10·Ö£©
¡à´ËʱOQ=3£¬OP=£¬OE=£»
¡àQE=3-=£¬PE=£¬
¡àPQ=£®£¨11·Ö£©
µãÆÀ£º±¾Ì⿼²éѧÉú½«¶þ´Îº¯ÊýµÄͼÏóÓë½âÎöʽÏà½áºÏ´¦ÀíÎÊÌâ¡¢½â¾öÎÊÌâµÄÄÜÁ¦£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º2010ÄêÕã½­Ê¡º¼ÖÝÊÐÏôɽÇøÖп¼ÊýѧģÄâÊÔ¾í34£¨ÒåÅî¶þÖÐ ÈÖÏþ¾ü£©£¨½âÎö°æ£© ÌâÐÍ£º½â´ðÌâ

£¨2009•ôë½­ÏØ£©Èçͼ£¬ÒÑÖªÅ×ÎïÏßy=a£¨x-1£©2+3£¨a¡Ù0£©¾­¹ýµãA£¨-2£¬0£©£¬Å×ÎïÏߵĶ¥µãΪD£¬¹ýO×÷ÉäÏßOM¡ÎAD£®¹ý¶¥µãƽÐÐÓÚxÖáµÄÖ±Ïß½»ÉäÏßOMÓÚµãC£¬BÔÚxÖáÕý°ëÖáÉÏ£¬Á¬½ÓBC£®
£¨1£©Çó¸ÃÅ×ÎïÏߵĽâÎöʽ£»
£¨2£©Èô¶¯µãP´ÓµãO³ö·¢£¬ÒÔÿÃë1¸ö³¤¶Èµ¥Î»µÄËÙ¶ÈÑØÉäÏßOMÔ˶¯£¬ÉèµãPÔ˶¯µÄʱ¼äΪt£¨s£©£®Îʵ±tΪºÎֵʱ£¬ËıßÐÎDAOP·Ö±ðΪƽÐÐËıßÐΣ¬Ö±½ÇÌÝÐΣ¬µÈÑüÌÝÐΣ¿
£¨3£©ÈôOC=OB£¬¶¯µãPºÍ¶¯µãQ·Ö±ð´ÓµãOºÍµãBͬʱ³ö·¢£¬·Ö±ðÒÔÿÃë1¸ö³¤¶Èµ¥Î»ºÍ2¸ö³¤¶Èµ¥Î»µÄËÙ¶ÈÑØOCºÍBOÔ˶¯£¬µ±ÆäÖÐÒ»¸öµãÍ£Ö¹Ô˶¯Ê±ÁíÒ»¸öµãÒ²Ëæֹ֮ͣÔ˶¯£®ÉèËüÃǵÄÔ˶¯µÄʱ¼äΪt£¨s£©£¬Á¬½ÓPQ£¬µ±tΪºÎֵʱ£¬ËıßÐÎBCPQµÄÃæ»ý×îС£¿²¢Çó³ö×îСֵ¼°´ËʱPQµÄ³¤£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º2011ÄêÕã½­Ê¡º¼ÖÝÊÐÖп¼ÊýѧģÄâÊÔ¾í£¨31£©£¨½âÎö°æ£© ÌâÐÍ£º½â´ðÌâ

£¨2009•ôë½­ÏØ£©Èçͼ£¬ÒÑÖªÅ×ÎïÏßy=a£¨x-1£©2+3£¨a¡Ù0£©¾­¹ýµãA£¨-2£¬0£©£¬Å×ÎïÏߵĶ¥µãΪD£¬¹ýO×÷ÉäÏßOM¡ÎAD£®¹ý¶¥µãƽÐÐÓÚxÖáµÄÖ±Ïß½»ÉäÏßOMÓÚµãC£¬BÔÚxÖáÕý°ëÖáÉÏ£¬Á¬½ÓBC£®
£¨1£©Çó¸ÃÅ×ÎïÏߵĽâÎöʽ£»
£¨2£©Èô¶¯µãP´ÓµãO³ö·¢£¬ÒÔÿÃë1¸ö³¤¶Èµ¥Î»µÄËÙ¶ÈÑØÉäÏßOMÔ˶¯£¬ÉèµãPÔ˶¯µÄʱ¼äΪt£¨s£©£®Îʵ±tΪºÎֵʱ£¬ËıßÐÎDAOP·Ö±ðΪƽÐÐËıßÐΣ¬Ö±½ÇÌÝÐΣ¬µÈÑüÌÝÐΣ¿
£¨3£©ÈôOC=OB£¬¶¯µãPºÍ¶¯µãQ·Ö±ð´ÓµãOºÍµãBͬʱ³ö·¢£¬·Ö±ðÒÔÿÃë1¸ö³¤¶Èµ¥Î»ºÍ2¸ö³¤¶Èµ¥Î»µÄËÙ¶ÈÑØOCºÍBOÔ˶¯£¬µ±ÆäÖÐÒ»¸öµãÍ£Ö¹Ô˶¯Ê±ÁíÒ»¸öµãÒ²Ëæֹ֮ͣÔ˶¯£®ÉèËüÃǵÄÔ˶¯µÄʱ¼äΪt£¨s£©£¬Á¬½ÓPQ£¬µ±tΪºÎֵʱ£¬ËıßÐÎBCPQµÄÃæ»ý×îС£¿²¢Çó³ö×îСֵ¼°´ËʱPQµÄ³¤£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º2010ÄêÕã½­Ê¡º¼ÖÝÊÐÏôɽÇøÖп¼ÊýѧģÄâÊÔ¾í48£¨ÐÂÍå³õÖÐ ºé¿­£©£¨½âÎö°æ£© ÌâÐÍ£º½â´ðÌâ

£¨2009•ôë½­ÏØ£©Èçͼ£¬ÒÑÖªÅ×ÎïÏßy=a£¨x-1£©2+3£¨a¡Ù0£©¾­¹ýµãA£¨-2£¬0£©£¬Å×ÎïÏߵĶ¥µãΪD£¬¹ýO×÷ÉäÏßOM¡ÎAD£®¹ý¶¥µãƽÐÐÓÚxÖáµÄÖ±Ïß½»ÉäÏßOMÓÚµãC£¬BÔÚxÖáÕý°ëÖáÉÏ£¬Á¬½ÓBC£®
£¨1£©Çó¸ÃÅ×ÎïÏߵĽâÎöʽ£»
£¨2£©Èô¶¯µãP´ÓµãO³ö·¢£¬ÒÔÿÃë1¸ö³¤¶Èµ¥Î»µÄËÙ¶ÈÑØÉäÏßOMÔ˶¯£¬ÉèµãPÔ˶¯µÄʱ¼äΪt£¨s£©£®Îʵ±tΪºÎֵʱ£¬ËıßÐÎDAOP·Ö±ðΪƽÐÐËıßÐΣ¬Ö±½ÇÌÝÐΣ¬µÈÑüÌÝÐΣ¿
£¨3£©ÈôOC=OB£¬¶¯µãPºÍ¶¯µãQ·Ö±ð´ÓµãOºÍµãBͬʱ³ö·¢£¬·Ö±ðÒÔÿÃë1¸ö³¤¶Èµ¥Î»ºÍ2¸ö³¤¶Èµ¥Î»µÄËÙ¶ÈÑØOCºÍBOÔ˶¯£¬µ±ÆäÖÐÒ»¸öµãÍ£Ö¹Ô˶¯Ê±ÁíÒ»¸öµãÒ²Ëæֹ֮ͣÔ˶¯£®ÉèËüÃǵÄÔ˶¯µÄʱ¼äΪt£¨s£©£¬Á¬½ÓPQ£¬µ±tΪºÎֵʱ£¬ËıßÐÎBCPQµÄÃæ»ý×îС£¿²¢Çó³ö×îСֵ¼°´ËʱPQµÄ³¤£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º2010Äêºþ±±Ê¡»Æ¸ÔÊÐä»Ë®ÏØÓàÑßÖÐѧ¾ÅÄ꼶ÊýѧÔ¿¼ÊÔ¾í£¨¶þ£©£¨½âÎö°æ£© ÌâÐÍ£º½â´ðÌâ

£¨2009•ôë½­ÏØ£©Èçͼ£¬ÒÑÖªÅ×ÎïÏßy=a£¨x-1£©2+3£¨a¡Ù0£©¾­¹ýµãA£¨-2£¬0£©£¬Å×ÎïÏߵĶ¥µãΪD£¬¹ýO×÷ÉäÏßOM¡ÎAD£®¹ý¶¥µãƽÐÐÓÚxÖáµÄÖ±Ïß½»ÉäÏßOMÓÚµãC£¬BÔÚxÖáÕý°ëÖáÉÏ£¬Á¬½ÓBC£®
£¨1£©Çó¸ÃÅ×ÎïÏߵĽâÎöʽ£»
£¨2£©Èô¶¯µãP´ÓµãO³ö·¢£¬ÒÔÿÃë1¸ö³¤¶Èµ¥Î»µÄËÙ¶ÈÑØÉäÏßOMÔ˶¯£¬ÉèµãPÔ˶¯µÄʱ¼äΪt£¨s£©£®Îʵ±tΪºÎֵʱ£¬ËıßÐÎDAOP·Ö±ðΪƽÐÐËıßÐΣ¬Ö±½ÇÌÝÐΣ¬µÈÑüÌÝÐΣ¿
£¨3£©ÈôOC=OB£¬¶¯µãPºÍ¶¯µãQ·Ö±ð´ÓµãOºÍµãBͬʱ³ö·¢£¬·Ö±ðÒÔÿÃë1¸ö³¤¶Èµ¥Î»ºÍ2¸ö³¤¶Èµ¥Î»µÄËÙ¶ÈÑØOCºÍBOÔ˶¯£¬µ±ÆäÖÐÒ»¸öµãÍ£Ö¹Ô˶¯Ê±ÁíÒ»¸öµãÒ²Ëæֹ֮ͣÔ˶¯£®ÉèËüÃǵÄÔ˶¯µÄʱ¼äΪt£¨s£©£¬Á¬½ÓPQ£¬µ±tΪºÎֵʱ£¬ËıßÐÎBCPQµÄÃæ»ý×îС£¿²¢Çó³ö×îСֵ¼°´ËʱPQµÄ³¤£®

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸