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Store S sold a total of 90 copies of a certain book during the seven days of last week, and it sold different numbers of copies on any two of the days. If for the seven days Store S sold the greatest number of copies on Saturday and the second greatest number of copies on Friday, did Store S sell more than 11 copies on Friday?
(1) Last week Store S sold 8 copies of the book on Thursday.
(2) Last week Store S sold 38 copies of the book on Saturday.
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
1)周四卖了8本,总共是90本,周五和周六的数量可以随意分配,只要排在第一第二位就可以
2)周六卖了38本,剩下52本,如果第二名的星期五卖的少于等于11本,取极限,当星期五卖11本时,剩余41本,只有5天可供分配,这四天最多卖10+9+8+7+6=40<41,所以假设不成立,周五必须卖11本以上
小良冠二郎
错选a,对于条件1没有假设极端情况,譬如Saturday售卖50本,Friday售卖9本。条件2里,我没去动笔算,想当然,酿成大祸
Kath1230
(2) Last week Store S sold 38 copies of the book on Saturday. Sat38本,就剩下52本,来试一下周五等于10的情况,就剩下42本,需要分到5天,这5天都不能大于10,所以取最大9,8,7,6,5,它们的和为35, 不够42,所以小于11不行,等于11的话,其他5天最多取,10,9,8,7,6 其和为40,比41小,所以也不能等于11,所以只有大于11
JHVKNK
问的问题是周五卖的有没有超过11本,看清楚问题
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