Mathematics

There's some problem about the word limits here. Please click the following links to see my solution. I only figured out question 1and 3.

http://hk.geocities.com/ytpelaine/y_knowledge_200108

2008-01-20 17:28:54 補充：
http://hk.geocities.com/ytpelaine/y_knowledge_200108

1, a = 2 , b = 3 , c = 9
2, 3
3, (pi)x = (pi) 1^2 / (2 x 3)
x = 1/6