document.write( "Question 1111997: Prove that the sum of rational numbers is rational. \n" ); document.write( "
Algebra.Com's Answer #727028 by Fombitz(32388)\"\" \"About 
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Assume a,b,c,d are integers and \"b%3C%3E0\" and \"d%3C%3E0\",
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\n" ); document.write( "\n" ); document.write( "\"a%2Fb%2Bc%2Fd=%28%28ad%2Bbc%29%29%2Fbd%29\"
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