ijÊл·±£²¿ÃÅͨ¹ýÑо¿¶àÄêÀ´¸ÃµØÇøµÄ´óÆøÎÛȾ״¿öºó£¬½¨Á¢ÁËÒ»¸öÔ¤²â¸ÃÊÐÒ»ÌìÖеĴóÆøÎÛȾָ±êf£¨t£©Óëʱ¼ät£¨µ¥Î»£ºÐ¡Ê±£©Ö®¼äµÄ¹ØϵµÄº¯ÊýÄ£ÐÍ£ºÊýѧ¹«Ê½£¬ÆäÖУ¬Êýѧ¹«Ê½´ú±í´óÆøÖÐijÀàËæʱ¼ät±ä»¯µÄµäÐÍÎÛȾÎïÖʵĺ¬Á¿£»²ÎÊýa´ú±íij¸öÒѲⶨµÄ»·¾³ÆøÏóÖ¸±ê£¬ÇÒÊýѧ¹«Ê½£®
£¨1£©Çóg£¨t£©µÄÖµÓò£»
£¨2£©Çóf£¨t£©µÄ×î´óÖµM£¨a£©µÄ±í´ïʽ£»
£¨3£©Èô¸ÃÊÐÕþ¸®ÒªÇóÿÌìµÄ´óÆø»·¾³×ÛºÏÖ¸Êý²»µÃ³¬¹ý2.0£¬ÊÔÎÊ£ºÈô°´¸ø¶¨µÄº¯ÊýÄ£ÐÍÔ¤²â£¬¸ÃÊÐÄ¿Ç°µÄ´óÆø»·¾³×ÛºÏÖ¸ÊýÊÇ·ñ»á³¬±ê£¿Çë˵Ã÷ÀíÓÉ£®

½â£º£¨1£©ÒòΪ0¡Üt¡Ü24£¬
µÃµ½|t-18|¡Ê[£¬]£¬
¸ù¾ÝÕýÏÒº¯ÊýµÄÐÔÖʵõ½g£¨t£©µÄÖµÓòΪ[0£¬]£»
£¨2£©ÓÉ£¨1£©¿ÉÖªg£¨t£©µÄÖµÓòΪ[0]£¬f£¨t£©µÄ×î´óÖµM£¨a£©£¬
µ±a¡Ê[0£¬]ʱ£¬M£¨a£©=|+-a|+2a=a+£»
µ±a¡Ê£¨£¬]ʱ£¬M£¨a£©=|-a|+2a=3a-£®
ÔòÓÐM£¨a£©=£»
£¨3£©µ±Ê±£¬M£¨a£©=¡Ü+=£¼2£»
µ±Ê±£¬M£¨a£©=¡Ü£®
ËùÒÔÈô°´¸ø¶¨µÄº¯ÊýÄ£ÐÍÔ¤²â£¬¸ÃÊÐÄ¿Ç°µÄ´óÆø»·¾³×ÛºÏÖ¸Êý²»»á³¬±ê£®
·ÖÎö£º£¨1£©Ïȸù¾ÝtµÄ·¶Î§Çó³ö|t-18|µÄ·¶Î§£¬½ø¶øÇó³ö|t-18|µÄ·¶Î§£¬È»ºó½áºÏÈý½Çº¯ÊýµÄÐÔÖÊÇó³ög£¨t£©µÄÖµÓò£»
£¨2£©ÓÉÌâÒâÏÈÇó³öf£¨t£©µÄ½âÎöʽ£¬È»ºóÔÚÇø¼ä[0£¬]ºÍ£¨£¬]ÉÏÌÖÂÛ¾ø¶ÔÖµµÄÈ¡ÖµµÃµ½M£¨a£©µÄ½âÎöʽΪ·Ö¶Îº¯Êý£»
£¨3£©ÀûÓã¨2£©µÄ½áÂÛ£¬·ÖʱºÍʱ·Ö±ðÌÖÂÛM£¨a£©µÄ×îÖµÓë2µÄ¹Øϵ¼´¿É£®
µãÆÀ£º±¾Ì⿼²éÀûÓú¯Êý֪ʶ½â¾öÓ¦ÓÃÌâµÄÓйØ֪ʶ£®Ð¸߿¼ÖеÄÖØÒªµÄÀíÄî¾ÍÊÇ°ÑÊýѧ֪ʶÔËÓõ½Êµ¼ÊÉú»îÖУ¬ÈçºÎ½¨Ä£Êǽâ¾öÕâÀàÎÊÌâµÄ¹Ø¼ü£®Í¬Ê±ÒªÊìÁ·µØÀûÓõ¼ÊýµÄ֪ʶ½â¾öº¯ÊýµÄÇó×îÖµÎÊÌ⣮
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

ijÊл·±£²¿ÃÅͨ¹ýÑо¿¶àÄêÀ´¸ÃµØÇøµÄ´óÆøÎÛȾ״¿öºó£¬½¨Á¢ÁËÒ»¸öÔ¤²â¸ÃÊÐÒ»ÌìÖеĴóÆøÎÛȾָ±êf£¨t£©Óëʱ¼ät£¨µ¥Î»£ºÐ¡Ê±£©Ö®¼äµÄ¹ØϵµÄº¯ÊýÄ£ÐÍ£ºf(t)=|g(t)+
1
3
-a|+2a£¬t¡Ê[0£¬24)
£¬ÆäÖУ¬g(t)=
1
2
sin(
¦Ð
24
|t-18|)
´ú±í´óÆøÖÐijÀàËæʱ¼ät±ä»¯µÄµäÐÍÎÛȾÎïÖʵĺ¬Á¿£»²ÎÊýa´ú±íij¸öÒѲⶨµÄ»·¾³ÆøÏóÖ¸±ê£¬ÇÒa¡Ê[0£¬
3
4
]
£®
£¨1£©Çóg£¨t£©µÄÖµÓò£»
£¨2£©Çóf£¨t£©µÄ×î´óÖµM£¨a£©µÄ±í´ïʽ£»
£¨3£©Èô¸ÃÊÐÕþ¸®ÒªÇóÿÌìµÄ´óÆø»·¾³×ÛºÏÖ¸Êý²»µÃ³¬¹ý2.0£¬ÊÔÎÊ£ºÈô°´¸ø¶¨µÄº¯ÊýÄ£ÐÍÔ¤²â£¬¸ÃÊÐÄ¿Ç°µÄ´óÆø»·¾³×ÛºÏÖ¸ÊýÊÇ·ñ»á³¬±ê£¿Çë˵Ã÷ÀíÓÉ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º2008ÄêÉϺ£ÊÐÆÕÍÓÇø¸ß¿¼ÊýѧһģÊÔ¾í£¨½âÎö°æ£© ÌâÐÍ£º½â´ðÌâ

ijÊл·±£²¿ÃÅͨ¹ýÑо¿¶àÄêÀ´¸ÃµØÇøµÄ´óÆøÎÛȾ״¿öºó£¬½¨Á¢ÁËÒ»¸öÔ¤²â¸ÃÊÐÒ»ÌìÖеĴóÆøÎÛȾָ±êf£¨t£©Óëʱ¼ät£¨µ¥Î»£ºÐ¡Ê±£©Ö®¼äµÄ¹ØϵµÄº¯ÊýÄ£ÐÍ£º£¬ÆäÖУ¬´ú±í´óÆøÖÐijÀàËæʱ¼ät±ä»¯µÄµäÐÍÎÛȾÎïÖʵĺ¬Á¿£»²ÎÊýa´ú±íij¸öÒѲⶨµÄ»·¾³ÆøÏóÖ¸±ê£¬ÇÒ£®
£¨1£©Çóg£¨t£©µÄÖµÓò£»
£¨2£©Çóf£¨t£©µÄ×î´óÖµM£¨a£©µÄ±í´ïʽ£»
£¨3£©Èô¸ÃÊÐÕþ¸®ÒªÇóÿÌìµÄ´óÆø»·¾³×ÛºÏÖ¸Êý²»µÃ³¬¹ý2.0£¬ÊÔÎÊ£ºÈô°´¸ø¶¨µÄº¯ÊýÄ£ÐÍÔ¤²â£¬¸ÃÊÐÄ¿Ç°µÄ´óÆø»·¾³×ÛºÏÖ¸ÊýÊÇ·ñ»á³¬±ê£¿Çë˵Ã÷ÀíÓÉ£®

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸