[計量] 有些文字繁瑣的計量請教課為板友

看板GRE (GRE入學考試)作者leobigpig (leobigpig)時間15年前 (2010/08/31 20:11)推噓0(0推 0噓 0→)

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這邊有些文字繁瑣的計量數學,我時在不懂這邊請教位味版友,題目有點多真的有點不好意思題目如下: In the rectangular coordinate system, if points (5,9), (X,1), and (4,5) lie on the same line, what is the value of X? Ans: x=3 S=7^0+7^1+7^2+…+7^20 Column A: The remainder when S id divided by 14 Column B: 1 Ans: C 這題是不是要找各個的規律,但前兩項是小數,後幾項都可以整除? A commuter drive to work 5 days a week. On the average, the trip to work takes 1 hour and 10 minutes and the trip home take 1 hour and 5 minutes. If the commuter works 40 weeks a year, the total commuting time for one year is equivalent to approximately how many 8-hour working days? Ans: 56 這邊我if 後就有點混亂了 Carpeting costs $9 per square meter. If there is an installation charge of $5 per room, what is the total cost, including the installation charge, of carpeting installed in 3 rectangular rooms, each 3 meters by 6 meters? Ans: 501 A candidate for public office allocated 1/3 of her campaign funds for television appearances, 2/3 of the remainder for personal appearances, and the balance for newspaper advertisements. If the amount allocated for newspaper advertisements was equally divided among 4 newspapers, what fraction of her original campaign funds was allocated for each newspaper? Ans: 1/18 不好意思,這題我完全看不懂 A worker stated to work on the 1st day of a certain month and worked for 8 consecutive days. If the worker earned $20 per day on each odd-numbered day and $30 per on each even-numbered day, what percent of the total amount earned on the 8 days was earned on the odd-numbered days? 我算 60% Ans: 40% If X is the greatest four-digit number such that the sum of the digits is 23 and no two digits are the same, which of the following is NOT a digit of x? Ans: 7 Two people invested equal amounts of money for one year, one at 8 percent simple annual interest and the other at 12 percent simple annual interest. If after the one year the amounts of money invested plus interest differed by $50, what was the original amount invested by each person? 不好意思這題我想了很久還是看不懂 Ans: $1250 If an employee deposited $2,000 in a new credit union account and made a single $200 deposit during each month thereafter, after how many deposits will the employee have deposited total of $10,000 in the credit union account? 我算40 因為第一次不能存錢要從第二次開始算嗎? Ans: 41 A tank in the shape of a rectangular solid is being fill with water at a constant rate so that the top surface of the water rises 7 meters every 7 hours. If the area of this rising surface is 12 square meters, what is the rate, in cubic meters per minute, at which the water is entering the tank? 我總是被文字題而煩惱 Ans: 0.2 Two strings with equal length are to be shaped, without overlap, into a circle and a square, respectively. Column A: The area of the circle. Column B: The area of the square. Ans: A 請教各位板友謝謝 -- http://www.youtube.com/watch?v=VJMbk9dtpdY