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Verified answer
6/(2+√5)= ( 6/ (2+√5) ) x ( (2-√5)/(2-√5))
= ( 6(2-√5) / (4-5))
= ( 6(2-√5) / (-1))
= -6(2-√5)
= -12 + 6√5 atau 6√5 - 12
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