8.2个立方体,每面都是一个数字,1-6,同时抛,问最上方的那一面数字之和是5或者9的概率多少? 5=2+3=1+4,so the probability could be 1/6 * 1/6 *2*2=1/9, 同理 9=3,6=4,5,p=1/9,so the final answer shall be 2/9.
此题的答案应该没有错
9.to make a food, one may use chocolate and peanut, the cost of 2 pounds chocolate and 3 pounds peanut to make such a food is 3.8 per pound, if the cost of chocolate is 2 more than (or less than) that of peanut, how much does peanut cost?
这个题是不是没给全呢? 还是我思路有误没算出来?
10.the volume of two sphere has a ratio of 64, then what is the ratio of its surface area?
RATION 只给了一个64,另一个没给, 估计思路就是球体体积4/3 pai d³, 求出R,然后再表面积公式4 PAI R平方 比一下作者: oceanfish 时间: 2010-5-25 21:18
11. in a room, the source of light is in the central of ceiling, the room has a width of 16, length of 12, a height of 10, then what is the greatest distance that a light beam could reach within the house? cube ,calculate the diagonal distance,对角线
相当简单,估计大家GWD和PREP都见过了
12. in a survey of the number of goose, scientists harvest A (数字忘记了)个 eggs and select 2 eggs out of 90% nests have more than 5 eggs, and there are B nests that have 4 eggs. There are no other nests. So what is the total number of nests surveyed ?
完全没看懂,求高人解答
13. X is a positive integer and the sum of all the units digit is 170 , Y is a integer, and X=10^20-Y, then what might be the value of Y?
此题的X=10^20-Y是什么意思?
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