ÌâÄ¿ÄÚÈÝ
ÔĶÁÀí½â£ºÍ¨¹ýѧϰÈý½Çº¯Êý£¬ÎÒÃÇÖªµÀÔÚÖ±½ÇÈý½ÇÐÎÖУ¬Ò»¸öÈñ½ÇµÄ´óС£¬ÓëÁ½Ìõ±ß³¤µÄ±ÈÖµÏ໥Ψһȷ¶¨£¬Òò´Ë±ß³¤Óë½ÇµÄ´óС֮¼ä¿ÉÒÔÏ໥ת»¯¡£ÀàËƵأ¬¿ÉÒÔÔÚµÈÑüÈý½ÇÐÎÖУ¬½¨Á¢±ß½ÇÖ®¼äµÄÁªÏµ¡£ÎÒÃǶ¨Ò壺µÈÑüÈý½ÇÐÎÖеױßÓëÑüµÄ±È½Ð×ö¶¥½ÇÕý¶Ô£¨sad£©¡£Èçͼ1£¬ÔÚ¨SABCÖУ¬AB=AC£¬¶¥½ÇAµÄÕý¶Ô¼Ç×÷sadA£¬ÕâʱsadA=µ×±ß¡ÂÑü=¡£ÈÝÒ×ÖªµÀÒ»¸ö½ÇµÄ´óС£¬ÓëÕâ¸ö½ÇµÄÕý¶ÔÖµÒ²ÊÇÏ໥Ψһȷ¶¨µÄ¡£¸ù¾ÝÉÏÊö½ÇµÄÕý¶Ô¶¨Ò壬½âÏÂÁÐÎÊÌ⣺
|
![](http://thumb.1010pic.com/pic1/2012/05/05/07/2012050507411872962702.files/image074.gif)
|
![](http://thumb.1010pic.com/pic1/2012/05/05/07/2012050507411872962702.files/image065.gif)
|
![](http://thumb.1010pic.com/pic1/2012/05/05/07/2012050507411872962702.files/image075.gif)
![](http://thumb.1010pic.com/pic1/2012/05/05/07/2012050507411872962702.files/image076.gif)
![](http://thumb.1010pic.com/pic1/2012/05/05/07/2012050507411872962702.files/image076.gif)
![](http://thumb.1010pic.com/pic1/2012/05/05/07/2012050507411872962702.files/image077.gif)
|
|
|
|
£¨3£©Èçͼ2£¬ÒÑÖªsinA=£¬ÆäÖСÏAΪÈñ½Ç£¬
ÊÔÇósadAµÄÖµ¡££¨À¼ÖÝÖп¼Ìâ¸Ä±à£© ͼ1 ͼ2
£¨1£© 1 £¨1·Ö£©
£¨2£©0 £¼sadA £¼2 £¨2·Ö£©
£¨3£©ÔÚ ABÉÏÈ¡µãD£¬Ê¹AD=AC£¬×÷DH¡ÍAC£¬HΪ´¹×㣬
ÁîBC=3k£¬AB=5k£¬Ò×µÃAD=AC=4k £¨2·Ö£©
ÓÉsinA=£¬¿ÉÇóDH=
£¬CD=
£¨2·Ö£©
ËùÒÔsadA= £¨1·Ö£©
![](http://thumb2018.1010pic.com/images/loading.gif)