某种商品进货价格为 a 元,出售价格为 b 元,假设对该商品每天早晨进货配齐 n 个,每日顾客
相互独立地到来,平均每日 m 人,且服从普阿松( Poisson)分布
!
)(
k
em
kP
−mk
= ,其中 k 为每日到来
的人数。问当 a=2、 b=3、 m=10 时,每天早晨该商品备齐多少个可得到最大利润。
文 件 列 表
Monte Carlo approximate pi lirun posssion 蒙特卡罗方法.pdf
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001103s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.066064s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001078s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001190s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001115s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003264s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000868s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004038s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.023631s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001529s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 13254 [ RunTime:0.015842s ]