ÌâÄ¿ÄÚÈÝ

ÈçͼËùʾ£¬Ä³Ð¡ÇøÒªÓÃÀé°ÊΧ³ÉÒ»¾ØÐλ¨Ì³£¬»¨Ì³µÄÒ»±ßÓÃ×ã¹»³¤µÄǽ£¬ÁíÍâÈý±ßËùÓõÄÀé°ÊÖ®ºÍÇ¡ºÃΪÃ×£®

£¨1£©Çó¾ØÐεÄÃæ»ý£¨Óñíʾ£¬µ¥Î»£ºÆ½·½Ã×£©Óë±ß£¨Óñíʾ£¬µ¥Î»£ºÃ×£©Ö®¼äµÄº¯Êý¹ØÏµÊ½£¨²»ÒªÇóд³ö×Ô±äÁ¿µÄȡֵ·¶Î§£©£»ÔõÑùΧ£¬¿Éʹ»¨Ì³Ãæ»ý×î´ó£¿

£¨2£©ÈçºÎΧ£¬¿Éʹ´Ë¾ØÐλ¨Ì³Ãæ»ýÊÇÆ½·½Ã×£¿

£¨1£©S=-2x2+16x£»AB=CD=4Ã×£¬BC=8Ã×ʱ£¬»¨Ì³µÄÃæ»ý×î´ó£»£¨2£©AB=CD=3Ã×£¬BC=10Ã×»òAB=CD=5Ã×£¬BC=6Ã×ʱ»¨Ì³Ãæ»ýÊÇ30ƽ·½Ã×£® ¡¾½âÎö¡¿ÊÔÌâ·ÖÎö£º£¨1£©AB£½x£¬ÔòBC£½16£­2x£¬¸ù¾Ý¾ØÐεÄÃæ»ý¹«Ê½¼´¿ÉµÃ³öSÓëxµÄº¯Êý¹ØÏµÊ½£»½«º¯Êý½âÎöʽÅä³É¶¥µãʽ¼´¿ÉÇó³öµ±xΪºÎֵʱSÈ¡×î´óÖµ£¬¼´¿ÉµÃ³ö´ð°¸£» £¨2£©°ÑS£½30´úÈ뺯Êý½âÎöʽ¼´¿ÉµÃ³ö´ð°¸£® ...
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø