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= 36(√11 - √5) / (√11 - √5)(√11 - √5) ----> ingat bahwa (√a + √b)(√a - √b)=a-b
= 36 (√11 - √5) / 11-5
= 36/6 (√11 - √5)
= 12(√11 - √5)
= 12√11 - 12√5
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