Problem 26975 --数学要好

26975: 数学要好

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 3  Solved: 3
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Description

Input

t,ab,(1<=t<=233;1<=a,b<=10000,)

Output

fg(f),4"no"

Sample Input

3
2 5
2 3
3 2

Sample Output

0.5156
5.7778
29.2500

HINT

Source

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