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15(√10 + √5) / √10 + √20 + √40 - √5 - √80 = ? = 15 (√10 + √5) / (√10 + 2√5 + 2√10 -√5 - 4√5) = 15 (√10 + √15) / 3√10 - 3√5 = 15(√10 + √5) / 3(√10 - √5) = 5(15 + 2√50) / 5 = 5(3 + 2√2)
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