2/ (5+√2) x (5-√2) / (5-√2) =
2(5-√2) / 25-2 =
(10-2√2)/23
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2/ (5+√2) x (5-√2) / (5-√2) =
2(5-√2) / 25-2 =
(10-2√2)/23
= 2 / (5+v2) x ((5-v2)/(5-v2)
= 2(5-v2) / (5+v2)(5-v2)
= 2(5-v2) / (25-2)
= 2/23 (5-v2) atau 10/23 - 2v2/23