ÎÒÃǸø³öÈç϶¨Òå:ÈôÒ»¸öËıßÐÎÖдæÔÚÏàÁÚÁ½±ßµÄƽ·½ºÍµÈÓÚÒ»Ìõ¶Ô½ÇÏßµÄƽ·½,Ôò³ÆÕâ¸öËıßÐÎΪ¹´¹ÉËıßÐÎ,ÕâÁ½ÌõÏàÁڵı߳ÆΪÕâ¸öËıßÐεĹ´¹É±ß.

(1)³ýÁËÕý·½ÐÎÍâ,д³öÄãËùѧ¹ýµÄÌØÊâËıßÐÎÖÐÊǹ´¹ÉËıßÐεÄÁ½ÖÖͼÐεÄÃû³Æ:         ;

(2)Èçͼ1,ÒÑÖª¸ñµã(СÕý·½ÐεĶ¥µã)O(0,0),A(3,0),B(0,4),ÇëÄã»­³öÒÔ¸ñµãΪ¶¥µã,OA,OBΪ¹´¹É±ßÇÒ¶Ô½ÇÏßÏàµÈµÄ¹´¹ÉËıßÐÎOAMB,²¢Ð´³öµãMµÄ×ø±ê;

(3)Èçͼ2,ÒÔ¦¤ABCµÄ±ßAB,ACΪ±ß,ÏòÈý½ÇÐÎÍâ×÷Õý·½ÐÎABDE¼°ACFG,Á¬½áCE,BGÏཻÓÚOµã,PÊÇÏ߶ÎDEÉÏÈÎÒâÒ»µã.ÇóÖ¤:ËıßÐÎOBPEÊǹ´¹ÉËıßÐÎ.

 

£¨1£©¾ØÐΣ®Õý·½Ðεȣ»£¨2£©£¨3£¬4£©£®£¨4£¬3£©£»£¨3£©ÂÔ

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

24¡¢ÎÒÃǸø³öÈç϶¨Ò壺ÈôÒ»¸öËıßÐεÄÁ½Ìõ¶Ô½ÇÏßÏàµÈ£¬Ôò³ÆÕâ¸öËıßÐÎΪµÈ¶Ô½ÇÏßËıßÐΣ®Çë½â´ðÏÂÁÐÎÊÌ⣺
£¨1£©Ð´³öÄãËùѧ¹ýµÄÌØÊâËıßÐÎÖÐÊǵȶԽÇÏßËıßÐεÄÁ½ÖÖͼÐεÄÃû³Æ£»
£¨2£©Ì½¾¿£ºµ±µÈ¶Ô½ÇÏßËıßÐÎÖÐÁ½Ìõ¶Ô½ÇÏßËù¼ÐÈñ½ÇΪ60¡ãʱ£¬Õâ¶Ô60¡ã½ÇËù¶ÔµÄÁ½±ßÖ®ºÍÓëÆäÖÐÒ»Ìõ¶Ô½ÇÏߵĴóС¹Øϵ£¬²¢Ö¤Ã÷ÄãµÄ½áÂÛ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

23¡¢ÎÒÃǸø³öÈç϶¨Ò壺ÈôÒ»¸öËıßÐÎÖдæÔÚÏàÁÚÁ½±ßµÄƽ·½ºÍµÈÓÚÒ»Ìõ¶Ô½ÇÏßµÄƽ·½£¬Ôò³ÆÕâ¸öËıßÐÎΪ¹´¹ÉËıßÐΣ¬ÕâÁ½ÌõÏàÁڵı߳ÆΪÕâ¸öËıßÐεĹ´¹É±ß£®
£¨1£©³ýÁËÕý·½ÐÎÍ⣬д³öÄãËùѧ¹ýµÄÌØÊâËıßÐÎÖÐÊǹ´¹ÉËıßÐεÄÁ½ÖÖͼÐεÄÃû³Æ£º
¾ØÐΡ¢Ö±½ÇÌÝÐÎ
£»
£¨2£©Èçͼ1£¬ÒÑÖª¸ñµã£¨Ð¡Õý·½ÐεĶ¥µã£©O£¨0£¬0£©£¬A£¨3£¬0£©£¬B£¨0£¬4£©£¬ÇëÄã»­³öÒÔ¸ñµãΪ¶¥µã£¬OA£¬OBΪ¹´¹É±ßÇÒ¶Ô½ÇÏßÏàµÈµÄ¹´¹ÉËıßÐÎOAMB£¬²¢Ð´³öµãMµÄ×ø±ê£»
£¨3£©Èçͼ2£¬ÒÔ¡÷ABCµÄ±ßAB£¬ACΪ±ß£¬ÏòÈý½ÇÐÎÍâ×÷Õý·½ÐÎABDE¼°ACFG£¬Á¬½ÓCE£¬BGÏཻÓÚOµã£¬PÊÇÏ߶ÎDEÉÏÈÎÒâÒ»µã£®ÇóÖ¤£ºËıßÐÎOBPEÊǹ´¹ÉËıßÐΣ®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

24¡¢ÎÒÃǸø³öÈç϶¨Ò壺ÈôÒ»¸öËıßÐÎÖдæÔÚÏàÁÚÁ½±ßµÄƽ·½ºÍµÈÓÚÒ»Ìõ¶Ô½ÇÏßµÄƽ·½£¬Ôò³ÆÕâ¸öËıßÐÎΪ¹´¹ÉËıßÐΣ¬ÕâÁ½ÌõÏàÁڵı߳ÆΪÕâ¸öËıßÐεĹ´¹É±ß£®
£¨1£©Ð´³öÄãËùѧ¹ýµÄÌØÊâËıßÐÎÖÐÊǹ´¹ÉËıßÐεÄÁ½ÖÖͼÐεÄÃû³Æ
¾ØÐÎ
£¬
Õý·½ÐÎ
£»
£¨2£©Èçͼ£¬ÒÑÖª¸ñµã£¨Ð¡Õý·½ÐεĶ¥µã£©O£¨0£¬0£©£¬A£¨3£¬0£©£¬B£¨0£¬4£©£¬ÇëÄã»­³öÒÔ¸ñµãΪ¶¥µã£¬OA£¬OBΪ¹´¹É±ßÇÒ¶Ô½ÇÏßÏàµÈµÄ¹´¹ÉËıßÐÎOAMB£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

27¡¢ÎÒÃǸø³öÈç϶¨Ò壺ÈôÒ»¸öËıßÐÎÖдæÔÚÏàÁÚÁ½±ßµÄƽ·½ºÍµÈÓÚÒ»Ìõ¶Ô½ÇÏßµÄƽ·½£¬Ôò³ÆÕâ¸öËıßÐÎΪ¹´¹ÉËıßÐΣ¬ÕâÁ½ÌõÏàÁڵı߳ÆΪÕâ¸öËıßÐεĹ´¹É±ß£®
£¨1£©Ð´³öÄãËùÖªµÀµÄÌØÊâËıßÐÎÖÐÊǹ´¹ÉËıßÐεÄÁ½ÖÖͼÐεÄÃû³Æ
Õý·½ÐÎ
£¬
³¤·½ÐÎ
£®
£¨2£©ÈçÏÂͼ£¨1£©£¬ÇëÄãÔÚͼÖл­³öÒÔ¸ñµãΪ¶¥µã£¬OA¡¢OBΪ¹´¹É±ß£¬ÇÒ¶Ô½ÇÏßÏàͬµÄËùÓй´¹ÉËıßÐÎOAMB£®
£¨3£©Èçͼ£¨2£©£¬ÒÔ¡÷ABC±ßAB×÷ÈçͼÕýÈý½ÇÐÎABD£¬¡ÏCBE=60¡ã£¬ÇÒBE=BC£¬Á¬½ÓDE¡¢DC£¬¡ÏDCB=30¡ã£®ÇóÖ¤£ºDC2+BC2=AC2£¬¼´ËıßÐÎABCDÊǹ´¹ÉËıßÐΣ®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º³õÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

ÎÒÃǸø³öÈç϶¨Ò壺ÈôÒ»¸öËıßÐÎABCDÖÐAC¡ÍBD£¬BDƽ·ÖAC£¬Ôò³ÆÕâ¸öËıßÐÎΪóÝÐÎËıßÐΣ®
£¨1£©Ð¡Ã÷˵£º¡°óÝÐÎËıßÐÎÒ»¶¨ÊÇÁâÐΡ±£®ÄãÈÏΪСÃ÷µÄ˵·¨ÊÇ·ñÕýÈ·£¿ÈôÕýÈ·Çë˵Ã÷ÀíÓÉ£»Èô²»ÕýÈ·£¬Çë¾Ù¸ö·´Àý˵Ã÷£®
£¨3£©ÔÚóÝÐÎABCDÖУ¬AD=CD£¬AB=BC£¬Èô¡ÏADC=¡ÏABC£¬tan¡ÏDAC=1£®ÇóÖ¤£ºóÝÐÎABCDÊÇÕý·½ÐΣ®

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸