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2. (5-√10)/(5+√10) x (5-√10)/(5-√10) =
((5-√10).(5-√10))/(25-10) =
((25 -10√10 + 10))/15 =
(35 - 10√10)/15 = ((5.(7-2√10))/15 = (7-2√10)/3
Mudah2an benar dan bermanfaat