((根号2-2)(1-根号2)+1))(根号2-1)计算
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((根号2-2)(1-根号2)+1))(根号2-1)计算
((根号2-2)(1-根号2)+1))(根号2-1)计算
((根号2-2)(1-根号2)+1))(根号2-1)计算
((根号2-2)(1-根号2)+1))(根号2-1)
=(√2-2-2+2√2+1)(√2-1)
=(3√2-3)(√2-1)
=3(√2-1)²
=3(2-2√2+1)
=9-6√2
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