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= (5√2 - 4)/(5√2 + 4) × (5√2 - 4)/(5√2 - 4)
= (5√2 - 4)(5√2 - 4)/(5√2 + 4)(5√2 - 4)
= (50 - 20√2 - 20√2 + 16)/(50 - 20√2 + 20√2 - 16)
= (66 - 40√2)/34
= (33 - 20√2)/17
maaf kalo salah
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