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1/31 北美 JJ
onion 2004-02-01 22:47:18
Just done it. Very tired now. Maybe later I can share more. I got quite a few here and would like to help out. Will definitely come back to answer questions.

1. Know W=k/(r^2). when r=4000, W=200. What is W when r=5600?

2. 0.99999*1.00001+.99998*1.00002=?

3. No.8 & No.11 & No.13 & No.14

4. There are five minorities in a nation, the total population is 50 millions, I, J, K, L, M, N (listed from the most to the least), the population in each minority might be equal, the N has 2 millions people, and M has 21 percent of the total population, what might be the most numbers of the population of L? (my ans: 6)

5. DS：what is X and Y
1 3x+4y=6
2.-12y-9x=-18

6. 10 stamps, 3 belong to B, randomly pick 2, what is the possibility that neither of these two are B's stamp?

7. (-1,3) and (2,-1) are endpoints of a diagnole of a square, what is the perimeter of the square.

8. 5 people race, no tie in the result. how many possible orders in which K is ahead of M. (ans: 60)

　

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