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2014-10-29T19:03:56+02:00
1/(√4+√5) + 1/(√5+√9) =(√4 -√5)/(-1) +(√5-√9)/(-4) =√5-2 +(3-√5)/4 =(4√5 -8 +3-√5)/4 = (3√5 -5)/4