Re: [計量] PP2-PS 3.4.18.33.43題
※ 引述《amateurptt (剩自己了...)》之銘言：
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: 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?
: (A)$15.60
: (B)$16.00
: (C)$17.50
: (D)$18.70
: (E)$19.10
: ans:D
: 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?
這題應該是題目不完全,PP裡面有出現[?]的就表示有缺的圖檔
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: 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?
: (A)38
: (B)36
: (C)35
: (D)34
: (E)32
: ans:D 想請問解題思路
這題首先要看的懂題目在問什麼,題目是說有一堆板子的堆疊,從最上面數下來的第20
塊板子在從最下面數上來的第16塊板子的下面;這題可以簡化題型,你可以拿5個硬幣
疊一疊,從上面數下來第4個硬幣在從下面數上來的第三個硬幣的下面,問總共有幾個?
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: 18. 3 teaspoons = 1 tablespoons
: 4 tablespoons = [?] cup
: According to the information above, how many teaspoons are equal to [?] cup?
: (A)3
: (B)4
: (C)9
: (D)12
: (E)18
: ans: E 一樣想請問解題思路
同第三題的說明
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: 33.If x^4 + y^4 = 100, then the greast possible value of x is between
: (A) 0 and 3
: (B) 3 and 6
: (C) 6 and 9
: (D) 9 and 12
: (E) 12 and 15
: 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!
你原本的想法沒錯,題目是要求x最大可能的值的範圍為何？
x要為最大,所以y^4=0
x=3時,x^4=81 ------(1)
x=4時,x^4=256 ------(2)
由(1)(2)可知x介於3到4之間,答案符合的就是(B)
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: 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?
: (A)16
: (B)24
: (C)26
: (D)30
: (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!
四對couples中選出三對*選出的三對中的每對選一人
也就是
4 2 2 2
C * * * = 32
3 1 1 1
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