※ 引述《amateurptt (剩自己了...)》之銘言： : ========================================================================= : 3. A certain taxi company charges $3.10 for the first [?] of a mile : plus $0.40 for each additional of a mile. What would this company : charge for a taxi ride that was 8 mile long? : 我的解法如下,請各位幫我看哪有出問題 : 3.10 + 7*0.40 但是與答案差相當多,我看錯題目嗎? mthe first [?] of a mile 總覺得少了些什麼 條件不夠 : ============================================================================ : 4.In a stack of boards at a lumber yard, the 20th board counting from : the top of the stack is immediately below the 16th board counting from : the bottom of the stack. How many boards are in the stack? : (D)34 : ans:D 想請問解題思路 一個堆疊 從上數來 第20個 會比從下面數來 第16個還低 (immediately below) Top Bottom 1 2 3 4 5 6 7 8 9 ... 18 19 20 16 15 14 13 12 11.....1 => 20+14 = 34 : =========================================================================== : 18. 3 teaspoons = 1 tablespoons : 4 tablespoons = [?] cup : According to the information above, how many teaspoons are equal to [?] cup? : ans: E 一樣想請問解題思路 同第一題 : =========================================================================== : 33.If x^4 + y^4 = 100, then the greast possible value of x is between : (A) 0 and 3 : (B) 3 and 6 : ans:B : 我原以為題目要x最大,所以就要y^4為0 : 也就是 直接求x^4=100 ,x的最小值為? : 但是答案不對,想請求正解! 設 y^4為0 求 x^4=100 (這樣X才會是最大) 3^4 = 81 <100 (3.1)^4 = 92多 <100 所以介於 3-6 : ============================================================================ : 43.A committee of three people is to be chosen from four married couples. : What is the number of different committees that can be chosen if two people : who are married to each other cannot both serve on the committee? : (E)32 : ans:E : 我的解法是 : 4 2 : C * C = 8 四對couples中選出三對 * 兩個人選一 : 3 1 : 似乎思路出了問題, 希望高手指正! C(4,3) 四對中選出三對 然後現在三對裡面 兩個人選一 C(2,1)*C(2,1)*C(2,1) (要做三次 因為有三組) =>4*8 = 32 以上 個人淺見 --

※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 218.167.173.185 ※ 編輯: burgessx 來自: 218.167.173.185 (06/16 21:20)