Re: [計量] The price of a certain hardback book …
※ 引述《minusthree (minus3)》之銘言：
: 1. a ,b are non-negative integrate
: column A : (a + b)^◇ column B: a + b^◇
: ans : c
不知道◇ 是啥鬼...
不會 = =+
: 2. x= 4y and x≠0 ,
: column A : the percent of x+y that x present column B: 75%
: ans:b
這題我有點問題...
column A : 是問說x在x+y裡面所佔的比率吧?
那應該是 x/(x+y) = 4y/(4y+y) = 4/5 = 80%
應該A比較大吧? 還是我理解有錯??
: 3. The volume of a cube is 64 ,
: column A : the area of the base of the cube column B: 32
: ans:b
A: 邊長4 面積16 <B
: 4. the price of a certain hardback book is 3 times the price of
: the paperback edition of the same book. At a sale, the number if
: hardback books sold was 5 times the number of paperback editions
: sold. If a total of $ 600 was collected from the sale of this book,
: how much was collected from the sale of the paperback edition?
: a) $ 37.5 b) $ 40.00 c) $66.67 d) $75.00 e) $ 360.0
: ans: e
: 我一直算出來 A 不知道是不是我題目意思理解錯了
: 希望有高手可以也解釋一下題目的意思^^a
hardback book的價格 是 paperback edition 的三倍
在一次販賣中 hardback book賣的量是paperback edition 的五倍
販賣所得600 問paperback edition共賣了多少錢??
價格設為 3T, T
量各賣了 5X, X
5X*3T+X*T=600 16XT=600 XT=37.5 我跟你算一樣 ^^
: 5. a couple sold their home 5 months before the annual coverage on
: their homeowner’s policy expired. If the company’s policy is to
: return 1/12 of the yearly premium for each month the policy is not
: used and their premium was $168 a year, how much of their payment would
: the insurance company return to them?
: a) $65 b) $70 c) $75 d) $93 e) $ 98
: ans: c
: 我算出來是bㄟ.....T_T
168*(5/12)= 70 我也一樣??
: 6. a grocer has 400 pounds of coffee in stock, 20 percent of which
: is decaffeinated. If the grocer buys another 100 pounds of coffee
: of which 60 percent is decaffeinated,what percent ,
: by weight , of the grocer’s stock of coffee is decaffeinated?
: a) 28% b) 30% c) 32% d)34% e) 40%
: ans: d
原先400, 裡面80是低卡
後來100, 裡面60是低卡
所以 (80+60)/(400+100)= 28% 答案錯??
: 7. 一個@,2個 $, 2個 #, 組成一個5位元的密碼
: column a: 總排列數 columnb: 30
: ans: c
總排列數=5!/(2*2)=5*3*2*1=30
有兩種重複
有錯請指正 ^^
: ==================================================
: 我問了好多.....|||||先謝謝各位高手幫忙 麻煩大家了
: 倒數幾天就要考試了......還是一點自信都沒有T_T
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