ÌâÄ¿ÄÚÈÝ
ijУ°ËÄ꼶¾ÙÐÐÑݽ²±ÈÈü£¬ÅÉÁËÁ½Î»ÀÏʦȥѧУ¸½½üµÄ³¬ÊйºÂò±Ê¼Ç±¾×÷Ϊ½±Æ·¡£¾¹ýÁ˽âµÃÖª£¬¸Ã³¬ÊеÄA£¬BÁ½ÖֱʼDZ¾µÄ¼Û¸ñ·Ö±ðÊÇ12ÔªºÍ8Ôª£¬ËûÃÇ×¼±¸¹ºÂòÕâÁ½ÖֱʼDZ¾¹²30±¾¡£
СÌâ1:Èç¹ûËûÃǼƻ®ÓÃ300Ôª¹ºÂò½±Æ·£¬ÄÇôÄÜÂòÕâÁ½ÖֱʼDZ¾¸÷¶àÉÙ±¾£¿
СÌâ2:Á½Î»ÀÏʦ¸ù¾ÝÑݽ²±ÈÈüµÄÉè½±Çé¿ö£¬¾ö¶¨Ëù¹ºÂòµÄAÖֱʼDZ¾µÄÊýÁ¿²»ÉÙÓÚBÖֱʼDZ¾ÊýÁ¿µÄ
£¬Èç¹ûÉèËûÃÇÂòAÖֱʼDZ¾n±¾£¬ÂòÕâÁ½ÖֱʼDZ¾¹²»¨·ÑwÔª¡£
¢ÙÇëд³öw£¨Ôª£©¹ØÓÚn£¨±¾£©µÄº¯Êý¹Øϵʽ£¬²¢Çó³ö×Ô±äÁ¿nµÄÈ¡Öµ·¶Î§£»
¢ÚÇëÄã°ïËûÃǼÆË㣬¹ºÂòÕâÁ½ÖֱʼDZ¾¸÷¶àÉÙʱ£¬»¨·Ñ×îÉÙ£¬´ËʱµÄ»¨·ÑÊǶàÉÙÔª£¿
СÌâ1:Èç¹ûËûÃǼƻ®ÓÃ300Ôª¹ºÂò½±Æ·£¬ÄÇôÄÜÂòÕâÁ½ÖֱʼDZ¾¸÷¶àÉÙ±¾£¿
СÌâ2:Á½Î»ÀÏʦ¸ù¾ÝÑݽ²±ÈÈüµÄÉè½±Çé¿ö£¬¾ö¶¨Ëù¹ºÂòµÄAÖֱʼDZ¾µÄÊýÁ¿²»ÉÙÓÚBÖֱʼDZ¾ÊýÁ¿µÄ

¢ÙÇëд³öw£¨Ôª£©¹ØÓÚn£¨±¾£©µÄº¯Êý¹Øϵʽ£¬²¢Çó³ö×Ô±äÁ¿nµÄÈ¡Öµ·¶Î§£»
¢ÚÇëÄã°ïËûÃǼÆË㣬¹ºÂòÕâÁ½ÖֱʼDZ¾¸÷¶àÉÙʱ£¬»¨·Ñ×îÉÙ£¬´ËʱµÄ»¨·ÑÊǶàÉÙÔª£¿
СÌâ1:ÉèÄÜÂòAÖֱʼDZ¾x±¾£¬ÔòÂòBÖֱʼDZ¾£¨30-x£©±¾¡£¡¡¡¡¡ 1·Ö
¸ù¾ÝÌâÒ⣬µÃ12x+8£¨30-x£©=300 ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ 2·Ö
½âÖ®µÃ x=15£¬¡à30-x=15 ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ 3·Ö
´ð£ºÄÜÂòA£¬BÁ½ÖֱʼDZ¾¸÷15±¾¡£¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡4·Ö
СÌâ2:¢Ùw=12n+8£¨30-n£©=4n+240 ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ 6·Ö
ÓÉn¡Ý

¡à×Ô±äÁ¿nµÄÈ¡Öµ·¶Î§ÊÇ12¡Ün¡Ü30µÄÕûÊý¡£¡¡¡¡¡¡¡¡¡¡¡¡¡¡9·Ö
¢Ú¡ß4£¾0£¬¡àwµÄÖµËæ×Ô±äÁ¿nµÄÔö´ó¶øÔö´ó£¬n±ØÐëÈ¡×îСֵ12¡£¡¡10·Ö
´Ëʱ30-n=18£¬w=4¡Á12+240=288 ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ 11·Ö
´ð£ºµ±ÂòAÖֱʼDZ¾12±¾£¬BÖֱʼDZ¾18±¾Ê±£¬Ëù»¨·Ñ×îÉÙ£¬Îª288Ôª¡£¡12·Ö
£¨1£©¸ù¾Ý×Ü·ÑÓÃΪ300Áз½³ÌÇó½â¼´¿É£»
£¨2£©¢Ù×Ü·ÑÓÃ=12¡ÁAÖֱʼDZ¾µÄ¼ÛÇ®+8¡ÁBÖֱʼDZ¾µÄ¼ÛÇ®£»×Ô±äÁ¿µÄÈ¡Öµ¸ù¾ÝËù¹ºÂòµÄAÖֱʼDZ¾µÄÊýÁ¿Òª²»ÉÙÓÚBÖֱʼDZ¾ÊýÁ¿£¬µ«ÓÖ²»¶àÓÚBÖֱʼDZ¾ÊýÁ¿2±¶Çó½â¼´¿É£»
¢Ú¸ù¾ÝÒ»´Îº¯ÊýµÄÐÔÖʺÍ×Ô±äÁ¿µÄÈ¡Öµ¿ÉµÃx×îСʱ£¬»¨·Ñ×îÉÙ
£¨2£©¢Ù×Ü·ÑÓÃ=12¡ÁAÖֱʼDZ¾µÄ¼ÛÇ®+8¡ÁBÖֱʼDZ¾µÄ¼ÛÇ®£»×Ô±äÁ¿µÄÈ¡Öµ¸ù¾ÝËù¹ºÂòµÄAÖֱʼDZ¾µÄÊýÁ¿Òª²»ÉÙÓÚBÖֱʼDZ¾ÊýÁ¿£¬µ«ÓÖ²»¶àÓÚBÖֱʼDZ¾ÊýÁ¿2±¶Çó½â¼´¿É£»
¢Ú¸ù¾ÝÒ»´Îº¯ÊýµÄÐÔÖʺÍ×Ô±äÁ¿µÄÈ¡Öµ¿ÉµÃx×îСʱ£¬»¨·Ñ×îÉÙ

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿