※ 引述《chia1985 (chia)》之铭言： : Q22: : A certain company assigns employees to offices in such a way : that some of the offices can be empty and more than one employee : can be assigned to an office. In how many ways can the company : assign 3 employees to 2 different offices? : A. 5 : B. 6 : C. 7 : D. 8 : E. 9 : Answer:D : 如果放法是(room1,room2)，有(3,0) (2,1) (1,2) (0,3)只有四种啊@@" : 为什麽是八种呢？谢谢~ 你以为放球啊?XDDDDDD人是有名字 公司房间也不同XDDD 甲乙丙 甲乙 丙 乙丙 甲 甲丙 乙 甲 乙丙 乙 甲丙 丙 甲乙 甲乙丙 : ---------------------------------------------------------------------- : Q28: : Last Sunday a certain store sold copies of Newspaper A for $1.00 : each and copies of Newspaper B for $1.25 each, and the store sold : no other newspapers that day. If r percent of the store’s revenues : from newspaper sales was from Newspaper A and if p percent of the : newspapers that the store sold were copies of newspaper A, which : of the following expresses r in terms of p? : A. 100p / (125 – p) : B. 150p / (250 – p) : C. 300p / (375 – p) : D. 400p / (500 – p) : E. 500p / (625 – p) : Answer:D 设全部卖100份 A卖p份 B卖100-p份 r/100 = p / [p+(100-p)1.25] = 100p/125-0.25p = 400p/(500-p) 故... : 这题没有idea ..>< 请高手帮忙^^ : 谢谢~ --

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