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=> (√2-√5) (√2-√5) / (√2)² - (√5)²
=> √4- √10 + √10+ √25 / 2-5
=> 2 - 2√10 + 5 / -3
=> 2+5- 2√10 / -3
=> 7- 2√10 / -3
jadi no 2 isinya d