1，according to the directions on a can of frozen orange juice concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice, how many 12-ounce cans of the concentrate are required to prepare 100 6-ounce servings of orange juice? 答案是25
看不懂啊。。。谁能翻译一下。。呜呜
2， If n and y are positive integers and 450y=n的三次方，which of the follwing must be an integer? 答案是第一个，我怎么觉得第一个和第二个都对。。
y/(3×2的平方×5)
y/(3的平方×2×5)
y/(3×2×5的平方)
3， all of the stocks on the over-the-counter market are designated by either a 4-letter or a 5-letter code that is created by using the 26 letters of the alphabet, which of the following gives the maximum number of different stocks that can be designated with these codes? 答案27(26的四次方)
没思路。。
谢谢各位啦。。。作者: season5924 时间: 2011-4-25 19:43
2，450=3*3*5*5*2，n为整数， y最小=3*5*2*2，所以A must be an integer
3，26的四次方+26的五次方...作者: liuyinghong 时间: 2011-4-26 06:40
