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=√8+√5 / √8+√5
=(3√5)(√8+√5) / 8-5
=(3√5)(√8+√5) / 3 =>angka 3 dan 3nya coret
=(√5)(√8+√5)
=√40 + √25
=√4×10 + 5
=2√10+5 (C)