ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬ÓÐÁ½¸ù³¤¾ùΪL¡¢ÖÊÁ¿¾ùΪmµÄϸµ¼Ìå°ôa¡¢b£¬ÆäÖÐa±»Ë®Æ½·ÅÖÃÔÚÇã½ÇΪ45¡ãµÄ¾øÔµ¹â»¬Ð±ÃæÉÏ£¬b±»Ë®Æ½¹Ì¶¨ÔÚбÃæµÄÓҲ࣬ÇÒÓëaÔÚͬһˮƽÃæÉÏ£¬a¡¢bÏ໥ƽÐС£µ±Á½Ï¸°ôÖоùͨÒÔ´óСΪIµÄͬÏòµçÁ÷ʱ£¬aÇ¡ÄÜÔÚбÃæÉϱ£³Ö¾²Ö¹£¬¹ØÓÚbµÄµçÁ÷ÔÚa´¦²úÉúµÄ´Å³¡µÄ´Å¸ÐӦǿ¶ÈB£¬ÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241642062443076.jpg)
A£®·½ÏòÊúÖ±ÏòÉÏ |
B£®´óСΪ![]() |
C£®´óСΪ![]() |
D£®ÈôʹbÊúÖ±ÏòÏÂÒƶ¯£¬aÈÔÄܱ£³Ö¾²Ö¹ |
CD
ÊÔÌâ·ÖÎö£ºÓÉ°²ÅඨÔò¿ÉÖªbµÄµçÁ÷ÔÚa´¦²úÉúµÄ´Å³¡µÄ´Å¸ÐӦǿ¶È·½ÏòÏòÉÏ£¬A´íÎó£®aµÄÊÜÁ¦Èçͼ¼×Ëùʾ£®
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241642070552806.png)
tan45¡ã£½
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164207430614.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164207648623.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164207945560.png)
¹ÊÑ¡CD
µãÆÀ£ºÑ§»áÇø·Ö×óÊÖ¶¨ÔòÓëÓÒÊÖÂÝÐý¶¨Ôò£¬Ç°ÕßÊÇÅж¨°²ÅàÁ¦µÄ·½Ïò£¬¶øºóÕßÊǵçÁ÷ÖÜΧ´Å³¡µÄ·½Ïò£®
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿