ÌâÄ¿ÄÚÈÝ
ÒÑÖªÃÀ¹úÆ»¹û¹«Ë¾Éú²úij¿îiPhoneÊÖ»úµÄÄê¹Ì¶¨³É±¾Îª40ÍòÃÀÔª£¬Ã¿Éú²ú1ÍòÖ»»¹ÐèÁíͶÈë16ÍòÃÀÔª£®ÉèÆ»¹û¹«Ë¾Ò»ÄêÄÚ¹²Éú²ú¸Ã¿îiPhoneÊÖ»úxÍòÖ»²¢È«²¿ÏúÊÛÍ꣬ÿÍòÖ»µÄÏúÊÛÊÕÈëΪR(x)ÍòÃÀÔª£¬ÇÒR(x)£½
(1)д³öÄêÀûÈóW(ÍòÃÀÔª)¹ØÓÚÄê²úÁ¿x(ÍòÖ»)µÄº¯Êý½âÎöʽ£»
(2)µ±Äê²úÁ¿Îª¶àÉÙÍòֻʱ£¬Æ»¹û¹«Ë¾ÔڸÿîiPhoneÊÖ»úµÄÉú²úÖÐËù»ñµÃµÄÀûÈó×î´ó£¿²¢Çó³ö×î´óÀûÈó£®
£¨1£©W£½£¨2£©x£½32ʱ£¬WÈ¡×î´óֵΪ6104.
¡¾½âÎö¡¿(1)µ±0<x¡Ü40£¬W£½xR(x)£(16x£«40)£½£6x2£«384x£40£»
µ±x>40£¬W£½xR(x)£(16x£«40)£½££16x£«7360.
ËùÒÔ£¬W£½
(2)¢Ùµ±0<x¡Ü40£¬W£½£6(x£32)2£«6104£¬
ËùÒÔWmax£½W(32)£½6104£»
¢Úµ±x>40ʱ£¬W£½££16x£«7360£¬
ÓÉÓÚ£«16x¡Ý2£½1600£¬
µ±ÇÒ½öµ±£½16x£¬¼´x£½50¡Ê(40£¬£«¡Þ)ʱ£¬WÈ¡×î´óֵΪ5760.
×ۺϢ٢ÚÖª£¬µ±x£½32ʱ£¬WÈ¡×î´óֵΪ6104.
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿