½«Á½¿é´óСһÑùº¬30¡ã½ÇµÄÖ±½ÇÈý½Ç°å£¬µþ·ÅÔÚÒ»Æð£¬Ê¹µÃËüÃǵÄб±ßABÖغϣ¬Ö±½Ç±ß²»Öغϣ¬ÒÑÖªAB£½8£¬BC£½AD£½4£¬ACÓëBDÏཻÓÚµãE£¬Á¬½áCD£®

(1)Ìî¿Õ£ºÈçͼ1£¬AC£½________£¬BD£½________£»ËıßÐÎABCDÊÇ________ÌÝÐΣ®

(2)Çëд³öͼ1ÖÐËùÓеÄÏàËÆÈý½ÇÐÎ(²»º¬È«µÈÈý½ÇÐÎ)£®

(3)Èçͼ2£¬ÈôÒÔABËùÔÚÖ±ÏßΪxÖᣬ¹ýµãA´¹Ö±ÓÚABµÄÖ±ÏßΪyÖὨÁ¢Èçͼ2µÄƽÃæÖ±½Ç×ø±êϵ£¬±£³Ö¡÷ABD²»¶¯£¬½«¡÷ABCÏòxÖáµÄÕý·½ÏòƽÒƵ½¡÷FGHµÄλÖã¬FHÓëBDÏཻÓÚµãP£¬ÉèAF£½t£¬¡÷FBPÃæ»ýΪS£¬ÇóSÓëtÖ®¼äµÄº¯Êý¹Øϵʽ£¬²¢Ð´³ötµÄÈ¡ÖµÖµ·¶Î§£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

½«Á½¿é´óСһÑùº¬30¡ã½ÇµÄÖ±½ÇÈý½Ç°å£¬µþ·ÅÔÚÒ»Æð£¬Ê¹µÃËüÃǵÄб±ßABÖغϣ¬Ö±½Ç±ß²»Öغϣ¬ÒÑÖªAB=8£¬B¾«Ó¢¼Ò½ÌÍøC=AD=4£¬ACÓëBDÏཻÓÚµãE£¬Á¬½ÓCD£®
£¨1£©Ìî¿Õ£ºÈçͼ£¬AC=
 
£¬BD=
 
£»ËıßÐÎABCDÊÇ
 
ÌÝÐΣ®
£¨2£©Çëд³öͼÖÐËùÓеÄÏàËÆÈý½ÇÐΣ¨²»º¬È«µÈÈý½ÇÐΣ©£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

½«Á½¿é´óСһÑùº¬30¡ã½ÇµÄÖ±½ÇÈý½Ç°å£¬µþ·ÅÔÚÒ»Æð£¬Ê¹µÃËüÃǵÄб±ßABÖغϣ¬Ö±½Ç±ß²»Öغϣ¬ÒÑÖªAB=8£¬BC=AD=4£¬ACÓëBDÏཻÓÚµãE£¬Á¬½ÓCD£®
¾«Ó¢¼Ò½ÌÍø
£¨1£©Ìî¿Õ£ºÈçͼ1£¬AC=
 
£¬BD=
 
£»ËıßÐÎABCDÊÇ
 
ÌÝÐΣ»
£¨2£©Çëд³öͼ1ÖÐËùÓеÄÏàËÆÈý½ÇÐΣ»£¨²»º¬È«µÈÈý½ÇÐΣ©
£¨3£©Èçͼ2£¬ÈôÒÔABËùÔÚÖ±ÏßΪÖᣬ¹ýµãA´¹Ö±ÓÚABµÄÖ±ÏßΪÖὨÁ¢Èçͼ2µÄƽÃæÖ±½Ç×ø±êϵ£¬±£³Ö¡÷ABD²»¶¯£¬½«¡÷ABCÏòxÖáµÄÕý·½ÏòƽÒƵ½¡÷FGHµÄλÖã¬FHÓëBDÏཻÓÚµãP£¬ÉèAF=t£¬¡÷FBPÃæ»ýΪS£¬ÇóSÓëtÖ®¼äµÄº¯Êý¹Øϵʽ£¬²¢Ð´³ötµÄÈ¡Öµ·¶Î§£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

Èçͼ£¬ÔÚƽÃæÖ±½Ç×ø±êϵÖУ¬½«Á½¿é´óСһÑùº¬30¡ã½ÇµÄÖ±½ÇÈý½Ç°å£¬µþ·ÅÔÚÒ»Æð£¬Ê¹µÃËüÃǵÄб±ßÖغÏÓÚOA£¬Ö±½Ç±ß²»Öغϣ¬ÒÑÖªA£¨6£¬0£©£¬AB=OC£¬ACÓëOB½»ÓÚµãD£¬Á¬½ÓBC£®
£¨1£©Ìî¿Õ£¬Èçͼ1£¬Dµã×ø±êÊÇ
 
£®
£¨2£©Èô½«¡÷OCAÈÄOAµÄÖеãPÄæʱÕëת90¡ãµ½¡÷O1C1A1µÄλÖã¬ÔòC1µÄ×ø±êΪ
 
£®
£¨3£©ÔÚ£¨2£©µÄÌõ¼þÏ£¬Çó¡÷OABÓë¡÷O1C1A1µÄÖصþ²¿·ÖµÄÃæ»ý£®
¾«Ó¢¼Ò½ÌÍø

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

¾«Ó¢¼Ò½ÌÍø½«Á½¿é´óСһÑùº¬30¡ã½ÇµÄÖ±½ÇÈý½Ç°åÈçͼµþ·ÅÔÚÒ»Æð£¬Ê¹ËüÃǵÄб±ßABÖغϣ¬Ö±½Ç±ß²»Öغϣ¬µ±AB=8cmʱ£¬ÔòÁ½¸öÖ±½Ç¶¥µãC¡¢DµÄ¾àÀëΪ
 
cm£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

½«Á½¿é´óСһÑùº¬30¡ã½ÇµÄÖ±½ÇÈý½Ç°å£¬°´Èçͼ¢ÙÓëͼ¢Ú·½Ê½µþ·ÅÔÚÒ»Æð£¬Ê¹µÃËüÃǵÄб±ßABÖغϣ¬Ö±½Ç±ß²»Öغϣ¬Á¬½ÓCD£®
£¨1£©Ìî¿Õ£º
ͼ¢ÙÖÐCDÓëAB
 
£¨ÌƽÐС±»ò¡°²»Æ½ÐС±£©£»
ͼ¢ÚÖÐCDÓëAB
 
£¨Ìî¡°´¹Ö±¡±»ò¡°²»´¹Ö±¡±£©£®²¢ÈÎÑ¡Ò»ÖÖÇé¿öÖ¤Ã÷£®
£¨2£©Çëд³öͼ¢ÙÖÐËùÓеĵÈÑüÈý½ÇÐΣ®
£¨3£©Èô°ÑÁ½¿éÈý½Ç°å°´Èçͼ¢ÛµÄ·½Ê½°Ú·Å£®ÒÑÖªBC=A1D=4£¬ÊÔÇó¡÷AB1CµÄÃæ»ý£¿
¾«Ó¢¼Ò½ÌÍø

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸