※ 引述《tecoteco (teco)》之銘言： : 1. 5x = 2y and xy ≠ 0, then is what percent of y ? : Ans: 40% (不會做,覺得題目錯了或是條件給太少) 我覺得是題目不健全耶。百分之幾的Y在問誰? : 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,個人覺得答案應該是 I and II only) 前面有人回文給我了，關於中位數的問題。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 (完全看不懂題目) 從10個數字裡選6個字母排列 : 從10個數字裡選五個字母排列 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 (明明題目有k*k, 為什麼答案都只有一個k?) 2k*(5k-1)= 10k^2-2k=k(10k-2) 選項寫錯了吧! : 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 (個人覺得答案應該是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 (看不懂題目) 個位數2 or 5結尾的是terminating decimal(注意需不需要約分) : 以上六題 懇請解答!! --

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