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Dangerous Expression for Rationals (Posted on 2013-03-31) Difficulty: 3 of 5
Prove or disprove the following statement:

Each positive rational number can be written in the form: (a^2+b^3)/(c^5+d^7)
where a,b,c,d are positive integers.

No Solution Yet Submitted by Danish Ahmed Khan    
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re: Question? | Comment 2 of 5 |
(In reply to Question? by Salil)

If indeed there's no way you can get any possible rational number from this format, then the idea is to prove that fact.
  Posted by Charlie on 2013-04-05 00:51:40

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