£¨±¾ÌâÂú·Ö14·Ö£¬µÚ£¨1£©Ð¡ÌâÂú·Ö4·Ö£¬µÚ£¨2£©¡¢£¨3£©Ð¡ÌâÂú·Ö¸÷5·Ö£©ÔÚRt¡÷ABCÖУ¬¡ÏACB£½90¡ã£¬BC£½30£¬AB£½50£®µãPÊÇAB±ßÉÏÈÎÒâÒ»µã£¬Ö±ÏßPE¡ÍAB£¬Óë±ßAC»òBCÏཻÓÚE£®µãMÔÚÏ߶ÎAPÉÏ£¬µãNÔÚÏ߶ÎBPÉÏ£¬EM£½EN£¬£®
£¨1£©Èçͼ1£¬µ±µãEÓëµãCÖغÏʱ£¬ÇóCMµÄ³¤£»
£¨2£©Èçͼ2£¬µ±µãEÔÚ±ßACÉÏʱ£¬µãE²»ÓëµãA¡¢CÖغϣ¬ÉèAP£½x£¬BN£½y£¬Çóy¹ØÓÚxµÄº¯Êý¹Øϵʽ£¬²¢Ð´³öº¯ÊýµÄ¶¨ÒåÓò£»
£¨3£©Èô¡÷AME¡×¡÷ENB£¨¡÷AMEµÄ¶¥µãA¡¢M¡¢E·Ö±ðÓë¡÷ENBµÄ¶¥µãE¡¢N¡¢B¶ÔÓ¦£©£¬ÇóAPµÄ³¤£®

(±¾ÌâÂú·Ö14·Ö£¬µÚ(1)СÌâÂú·Ö4·Ö£¬µÚ(2)¡¢(3)СÌâÂú·Ö¸÷5·Ö)
[½â] (1) ÓÉAE=40£¬BC=30£¬AB=50£¬ÞCP=24£¬ÓÖsinÐEMP=ÞCM=26¡£
(2) ÔÚRt¡÷AEPÅcRt¡÷ABCÖУ¬¡ßÐEAPBAC£¬¡à Rt¡÷AEP ~ Rt¡÷ABC£¬
¡à£¬¼´£¬¡àEP=x£¬
ÓÖsinÐEMP=ÞtgÐEMP==Þ=£¬¡àMP=x=PN£¬
BN=AB-AP-PN=50-x-x=50-x (0<x<32)¡£
(3) j®”EÔÚ¾€¶ÎACÉÏ•r£¬ÓÉ(2)Öª£¬£¬¼´£¬ÞEM=x=EN£¬
ÓÖAM=AP-MP=x-x=x£¬
ÓÉî}ÔO¡÷AME ~ ¡÷ENB£¬¡à£¬Þ=£¬½âµÃx=22=AP¡£
k®”EÔÚ¾€¶ÎBCÉÏ•r£¬ÓÉî}ÔO¡÷AME ~ ¡÷ENB£¬¡àÐAEMEBN¡£
ÓÉÍâ½Ç¶¨Àí£¬ÐAECEABEBNEABAEMEMP£¬
¡àRt¡÷ACE ~ Rt¡÷EPM£¬Þ£¬¼´£¬ÞCE=¡­j¡£
ÔOAP=z£¬¡àPB=50-z£¬
ÓÉRt¡÷BEP ~ Rt¡÷BAC£¬Þ£¬¼´=£¬ÞBE=(50-z)£¬¡àCE=BC-BE=30-(50-z)¡­k¡£
ÓÉj£¬k£¬½â=30-(50-z)£¬µÃz=42=AP¡£

½âÎö

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

£¨±¾ÌâÂú·Ö14·Ö£¬µÚ(1)СÌâ4·Ö£¬µÚ(2)СÌâ¢Ù6·Ö¡¢µÚ(2)СÌâ¢Ú4·Ö£©

Ö±½ÇÈý½Ç°åABCÖУ¬¡ÏA=30¡ã£¬BC£½1.½«ÆäÈÆÖ±½Ç¶¥µãCÄæʱÕëÐýתһ¸ö½Ç£¨ÇÒ¡Ù 90¡ã£©£¬µÃµ½Rt¡÷£¬

£¨1£©Èçͼ9£¬µ±±ß¾­¹ýµãBʱ£¬ÇóÐýת½ÇµÄ¶ÈÊý£»

£¨2£©ÔÚÈý½Ç°åÐýתµÄ¹ý³ÌÖУ¬±ßÓëABËùÔÚÖ±Ïß½»ÓÚµãD£¬¹ýµã D×÷DE¡Î½»±ßÓÚµãE£¬Áª½áBE.

¢Ùµ±Ê±£¬É裬£¬ÇóÓëÖ®¼äµÄº¯Êý½âÎöʽ¼°¶¨ÒåÓò£»

¢Úµ±Ê±£¬ÇóµÄ³¤.

      

 

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º2011½ìÉϺ£ÊÐÆÕÍÓÇø4ÔÂÖп¼Ä£ÄâÊýѧÊÔ¾í ÌâÐÍ£º½â´ðÌâ

£¨±¾ÌâÂú·Ö14·Ö£¬µÚ(1)СÌâ4·Ö£¬µÚ(2)СÌâ¢Ù6·Ö¡¢µÚ(2)СÌâ¢Ú4·Ö£©
Ö±½ÇÈý½Ç°åABCÖУ¬¡ÏA=30¡ã£¬BC£½1.½«ÆäÈÆÖ±½Ç¶¥µãCÄæʱÕëÐýתһ¸ö½Ç£¨ÇÒ¡Ù 90¡ã£©£¬µÃµ½Rt¡÷£¬
£¨1£©Èçͼ9£¬µ±±ß¾­¹ýµãBʱ£¬ÇóÐýת½ÇµÄ¶ÈÊý£»
£¨2£©ÔÚÈý½Ç°åÐýתµÄ¹ý³ÌÖУ¬±ßÓëABËùÔÚÖ±Ïß½»ÓÚµãD£¬¹ýµã D×÷DE¡Î½»±ßÓÚµãE£¬Áª½áBE.
¢Ùµ±Ê±£¬É裬£¬ÇóÓëÖ®¼äµÄº¯Êý½âÎöʽ¼°¶¨ÒåÓò£»
¢Úµ±Ê±£¬ÇóµÄ³¤.

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º2011Äê³õÖбÏÒµÉýѧ¿¼ÊÔ£¨Ìì½ò¾í£©Êýѧ ÌâÐÍ£º½â´ðÌâ

£¨±¾ÌâÂú·Ö14·Ö£¬µÚ£¨1£©Ð¡ÌâÂú·Ö4·Ö£¬µÚ£¨2£©¡¢£¨3£©Ð¡ÌâÂú·Ö¸÷5·Ö£©ÔÚRt¡÷ABCÖУ¬¡ÏACB£½90¡ã£¬BC£½30£¬AB£½50£®µãPÊÇAB±ßÉÏÈÎÒâÒ»µã£¬Ö±ÏßPE¡ÍAB£¬Óë±ßAC»òBCÏཻÓÚE£®µãMÔÚÏ߶ÎAPÉÏ£¬µãNÔÚÏ߶ÎBPÉÏ£¬EM£½EN£¬£®

£¨1£©Èçͼ1£¬µ±µãEÓëµãCÖغÏʱ£¬ÇóCMµÄ³¤£»

£¨2£©Èçͼ2£¬µ±µãEÔÚ±ßACÉÏʱ£¬µãE²»ÓëµãA¡¢CÖغϣ¬ÉèAP£½x£¬BN£½y£¬Çóy¹ØÓÚxµÄº¯Êý¹Øϵʽ£¬²¢Ð´³öº¯ÊýµÄ¶¨ÒåÓò£»

£¨3£©Èô¡÷AME¡×¡÷ENB£¨¡÷AMEµÄ¶¥µãA¡¢M¡¢E·Ö±ðÓë¡÷ENBµÄ¶¥µãE¡¢N¡¢B¶ÔÓ¦£©£¬ÇóAPµÄ³¤£®

 

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º2010-2011ѧÄêÉϺ£Êп¼Ä£ÄâÊýѧÊÔ¾í ÌâÐÍ£º½â´ðÌâ

£¨±¾ÌâÂú·Ö14·Ö£¬µÚ£¨1£©¡¢£¨2£©Ð¡ÌâÿСÌâÂú·Ö5·Ö£¬µÚ£¨3£©Ð¡ÌâÂú·Ö4·Ö£©

ÒÑÖª£¬Ôڱ߳¤Îª6µÄÕý·½ÐÎABCDµÄÁ½²àÈçͼ×÷Õý·½ÐÎBEFG¡¢Õý·½ÐÎDMNK£¬Ç¡ºÃʹµÃN¡¢A¡¢FÈýµãÔÚÒ»Ö±ÏßÉÏ£¬Áª½áMF½»Ï߶ÎADÓÚµãP£¬Áª½áNP£¬ÉèÕý·½ÐÎBEFGµÄ±ß³¤Îªx£¬Õý·½ÐÎDMNKµÄ±ß³¤Îªy£¬

£¨1£©Çóy¹ØÓÚxµÄº¯Êý¹Øϵʽ¼°×Ô±äÁ¿xµÄÈ¡Öµ·¶Î§£»

£¨2£©µ±¡÷NPFµÄÃæ»ýΪ32ʱ£¬ÇóxµÄÖµ£»

£¨3£©ÒÔPΪԲÐÄ£¬APΪ°ë¾¶µÄÔ²ÄÜ·ñÓëÒÔGΪԲÐÄ£¬GFΪ°ë¾¶µÄÔ²ÏàÇУ¬ÈôÄÜÇëÇóxµÄÖµ£¬Èô²»ÄÜ£¬Çë˵Ã÷ÀíÓÉ¡£

 

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸