SOLUTION: Prove that the sum of rational numbers is rational.

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Question 1111997: Prove that the sum of rational numbers is rational.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Assume a,b,c,d are integers and b%3C%3E0 and d%3C%3E0,
a%2Fb%2Bc%2Fd=%28a%2Fb%29%28d%2Fd%29%2B%28c%2Fd%29%28b%2Fb%29
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a%2Fb%2Bc%2Fd=%28ad%2Fbd%29%2B%28bc%2Fbd%29
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a%2Fb%2Bc%2Fd=%28%28ad%2Bbc%29%29%2Fbd%29