13£®Ä³¹«Ë¾Ã¿ÔÂ×î¶àÉú²ú100̨¾¯±¨ÏµÍ³×°Öã¬Éú²úx̨£¨x¡ÊN*£©µÄ×ÜÊÕÈëΪ30x-0.2x2£¨µ¥Î»£ºÍòÔª£©£®Ã¿ÔÂͶÈëµÄ¹Ì¶¨³É±¾£¨°üÀ¨»úе¼ìÐÞ¡¢¹¤È˹¤×ʵȣ©Îª40ÍòÔª£¬´ËÍ⣬ÿÉú²úһ̨»¹Ðè²ÄÁϳɱ¾5ÍòÔª£®ÔÚ¾­¼ÃѧÖУ¬³£³£ÀûÓÃÿÔÂÀûÈóº¯ÊýP£¨x£©µÄ±ß¼ÊÀûÈóº¯ÊýMP£¨x£©À´Ñо¿ºÎʱ»ñµÃ×î´óÀûÈ󣬯äÖÐMP£¨x£©=P£¨x+1£©-P£¨x£©£®
£¨¢ñ£©ÇóÀûÈóº¯ÊýP£¨x£©¼°Æä±ß¼ÊÀûÈóº¯ÊýMP£¨x£©£»
£¨¢ò£©ÀûÓñ߼ÊÀûÈóº¯ÊýMP£¨x£©Ñо¿£¬¸Ã¹«Ë¾Ã¿ÔÂÉú²ú¶àÉŲ̀¾¯±¨ÏµÍ³×°Ö㬿ɻñµÃ×î´óÀûÈó£¿×î´óÀûÈóÊǶàÉÙ£¿

·ÖÎö £¨¢ñ£©ÀûÓÃÀûÈóÊÇÊÕÈëÓë³É±¾Ö®²î£¬ÇóÀûÈóº¯ÊýP£¨x£©£¬ÀûÓÃMP£¨x£©=P£¨x+1£©-P£¨x£©£¬ÇóÆä±ß¼ÊÀûÈóº¯ÊýMP£¨x£©£»
£¨¢ò£©ÀûÓÃMP£¨x£©=24.8-0.4xÊǼõº¯Êý£¬¼´¿ÉµÃ³ö½áÂÛ£®

½â´ð ½â£º£¨¢ñ£©ÓÉÌâÒâÖª£¬x¡Ê[1£¬100]£¬ÇÒx¡ÊN*
P£¨x£©=R£¨x£©-C£¨x£©
=30x-0.2x2-£¨5x+40£©
=-0.2x2+25x-40£¬
MP£¨x£©=P£¨x+1£©-P£¨x£©
=-0.2£¨x+1£©2+25£¨x+1£©-40-[-0.2x2+25x-40]
=24.8-0.4x£¬
£¨¢ò£©¡ßMP£¨x£©=24.8-0.4xÊǼõº¯Êý£¬
¡àµ±x=1ʱ£¬MP£¨x£©µÄ×î´óֵΪ24.40£¨ÍòÔª£©

µãÆÀ ±¾Ì⿼²éÁ˺¯ÊýµÄʵ¼ÊÓ¦Ó㬿¼²é¶þ´Îº¯ÊýÄ£ÐÍ£¬½âÌâ²ßÂÔ£º¹¹Ôì¶þ´Îº¯ÊýÄ£ÐÍ£¬º¯Êý½âÎöʽÇó½âÊǹؼü£¬È»ºóÀûÓÃÅä·½·¨¡¢ÊýÐνáºÏ·¨µÈ·½·¨Çó½â¶þ´Îº¯Êý×îÖµ£¬µ«Òª×¢Òâ×Ô±äÁ¿µÄʵ¼Êȡֵ·¶Î§£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

3£®ÔÚÆ½ÃæÖ±½Ç×ø±êϵxOyÖУ¬ÒÔOxÖáµÄ·Ç¸º°ëÖáΪʼ±ß×÷Á½¸öÈñ½Ç¦Á£¬¦Â£¬ËüÃǵÄÖձ߷ֱðÓ뵥λԲ½»ÓÚA£¬BÁ½µã£¬ÒÑÖªA£¬BµÄ×Ý×ø±ê·Ö±ðΪ$\frac{\sqrt{5}}{5}$£¬$\frac{3\sqrt{10}}{10}$
£¨1£©Çó¦Á-¦Â£»
£¨2£©Çócos£¨2¦Á-¦Â£©µÄÖµ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

4£®¸ø³öÏÂÁÐÃüÌ⣺
¢ÙÃݺ¯Êýy=x0µÄͼÏóΪһÌõÖ±Ïߣ»
¢ÚÈôÃݺ¯Êýy=xaµÄͼÏó¹ýÔ­µã£¬Ôòa£¾0£»
¢ÛÈôÃݺ¯Êýy=xa£¨a£¼0£©ÊÇÆæº¯Êý£¬Ôòy=xaÔÚÆä¶¨ÒåÓòÄÚÒ»¶¨ÊǼõº¯Êý£»
¢ÜÃݺ¯Êýy=xaͼÏ󲻿ÉÄܳöÏÖÔÚµÚËÄÏóÏÞÄÚ£¬
ÆäÖÐÕæÃüÌâµÄÐòºÅΪ¢Ú¢Ü£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

1£®É輯ºÏA={x|2x2+3px+2=0}£¬B={x|2x2+x+q=0}£¬ÆäÖÐp£¬qΪ³£Êý£¬x¡ÊR£¬ÈôA¡ÉB={$\frac{1}{2}$}ʱ£¬Çóp£¬qµÄÖµºÍA¡ÈB£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÑ¡ÔñÌâ

8£®ÒÑÖª¼¯ºÏA={1£¬2£¬3}£¬B={1£¬m}£¬A¡ÉB=B£¬ÔòʵÊýmµÄֵΪ£¨¡¡¡¡£©
A£®2B£®3C£®1»ò2»ò3D£®2»ò3

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

18£®º¯Êýf£¨x£©=loga£¨x+28£©-3£¨a£¾0ÇÒa¡Ù1£©µÄͼÏóºã¹ý¶¨µãA£¬ÈôµãAµÄºá×ø±êΪx0£¬º¯Êýg£¨x£©=a${\;}^{x-{x_0}}}$+4µÄͼÏóºã¹ý¶¨µãB£¬ÔòBµãµÄ×ø±êΪ£¨-27£¬5£©£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

5£®²»µÈʽ×é$\left\{\begin{array}{l}{x-y¡Ü0}\\{x+y¡Ý-2}\\{x-2y¡Ý-2}\end{array}\right.$µÄ½â¼¯ÎªD£¬Èô£¨a£¬b£©¡ÊD£¬Ôòz=2a-3bµÄ×îСֵÊÇ-4£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£º½â´ðÌâ

2£®ÒÑÖªº¯Êýf£¨x£©=ln£¨x+$\sqrt{{x^2}+1}}$£©+ax7+bx3-4£¬ÆäÖÐa£¬bΪ³£Êý£¬Èôf£¨-3£©=4£¬Ôòf£¨3£©=-12£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£ºÌî¿ÕÌâ

3£®[$\root{3}{£¨-5£©^{2}}$]${\;}^{\frac{3}{4}}$=$\sqrt{5}$£®

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸