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= 3-√2 (3-√2) / 9-√4
= 9-3√2-3√2+√4 / 9-2
= 9-3√2-3√2+2 / 7
= 9+2-6√2 / 7
= 11-6√2 / 7
maaf kalo salah... yang aku tau caranya begitu...