document.write( "Question 522372: I'm currently working on Lesson 5-6 Sums and Differences of Rational Expressions. It's relatively easy, I'm not having too much of a problem with it. Here's the problem:\r
\n" ); document.write( "\n" ); document.write( "17. a/bc + b/ac + c/ab\r
\n" ); document.write( "\n" ); document.write( "the answer is a^2 + b^2 + c^2 over abc.\r
\n" ); document.write( "\n" ); document.write( "i'm confused how they got that. I can almost unerstand. One of those tip of the tongue kind of things. Please help!
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Algebra.Com's Answer #346820 by scott8148(6628)\"\" \"About 
You can put this solution on YOUR website!
abc is the lowest common denominator (LCD)\r
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\n" ); document.write( "\n" ); document.write( "when you convert each of the fractions to the LCD, you multiply the numerator by the missing factor
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