※ 引述《oranger (从新出发)》之铭言： : 202. : Each employee of Company Z is an employee of either Division X or Division Y, : but not both. If each division has some part-time employees, is the ratio of : the number of full-time employees to the number of part-time employees : greater for Division X than for Company Z ? : (1) The ratio of the number of full-time employees to the number of part-time : employees is less for Division Y than for Company Z. : (2) More than half of the full-time employees of Company Z are employees of : Division X, and more than half of the part-time employees of Company Z are : employees of Division Y. : Ans: D : 请大家帮忙了!! 谢谢~ 令X部门full time Xf人 part time Xp人 Y部门full time Yf人 part time Yp人 (1) Yf Xf + Yf Xf + Yf Xf Yf -- < ------- 以算术平均数的概念来看, ------- 为 -- 与 -- 之平均值 Yp Xp + Yp Xp + Yp Xp Yp Yf Xf + Yf Xf 所以 -- < ------- < -- Yp Xp + Yp Xp (2) 因为 Xf > Yf 我们再令Xf = Yf + a 其中a为大於0的常数 因为 Xp < Yp 我们再令Yp = Xp + b 其中b为大於0的常数 Xf + Yf Xf + Xf - a 2Xf 则 ---------- = --------------- 与 -------- 相比 Xp + Yp Xp + Xp + b 2Xp 分母变大且分子变小, 又分母分子都为正整数, 所以必然比较小. 所以答案是D --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 118.231.137.108 ※ 编辑: MrGust 来自: 118.231.137.108 (09/05 13:44)