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Diao Ze likes math very much, especially problems about equation. Now there is a problem for Diao Ze, but he is too lazy to solve it and he asks you for help:
Giving two integers a and b , which satisfied the equation
Then your task is to calculate the value of x in the equation.
The first line contains an integer T , indicating the total number of test cases. In each test case there is only one line contains two positive integers .png){kind=small}
and.png){kind=small}
For each test case, output the answer in one line. The answer should be rounded to 2 digits after the decimal point.
2 1 2 3 2
2.00 0.67
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原文地址：http://www.cnblogs.com/yinghualuowu/p/5495622.html
