※ 引述《tecoteco (teco)》之铭言： : 1. 5x = 2y and xy ≠ 0, then is what percent of y ? : Ans: 40% (不会做,觉得题目错了或是条件给太少) 我觉得是题目不健全耶。百分之几的Y在问谁? : 2. 150, 200, 250, n : which of the following could be the median of the 4 integers listed above? : I. 175 : II. 215 : III. 235 : Ans: II and III only (不懂,个人觉得答案应该是 I and II only) 前面有人回文给我了，关於中位数的问题。很清楚。 : 3. If a code word is defined to be a sequence of different letters chosen : from the 10 letters A, B, C, D, E, F, G, H, I, and J, what is the ratio : of the number of 5-letter code word to the number of 4-letter code words? : Ans: 6 to 1 (完全看不懂题目) 从10个数字里选6个字母排列 : 从10个数字里选五个字母排列 10*9*8*7*6 : 10*9*8*7 = 6 : 1 : 4. Which of the following is equal to (2k)(5k-1)? : A. 2(10k-1) B. 5(10k-1) C. 10k D. 2(10k) E. 102k-1 : Ans: A (明明题目有k*k, 为什麽答案都只有一个k?) 2k*(5k-1)= 10k^2-2k=k(10k-2) 选项写错了吧! : 5. From a group of 3 boys and 3 girls, 4 children are to be randomly : selected. What is the probability that equal numbers of boys and girls : will be selected ? : Ans: 4/9 (个人觉得答案应该是3/5) 2男2女 C(3,2)(C3,2)/C(6,4)= 3/5 : 6. Which of the following fractions has a equivalent that is a terminating : decimal ? : A. 10/189 B. 15/196 C. 16/225 D. 39/128 : Ans: D (看不懂题目) 个位数2 or 5结尾的是terminating decimal(注意需不需要约分) : 以上六题 恳请解答!! --

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