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Help! how to solve this roots manually

  1. Oct 21, 2012 #1
    i find it puzzling how to solve this,,. (2)^1/6 or (20)^1/8 without a calculator
  2. jcsd
  3. Oct 21, 2012 #2


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  4. Oct 21, 2012 #3
    great! thnks
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