2-√2+ ___2__ 2√2-2

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2-√2+ ___2__ 2√2-2

2-√2+ ___2__ 2√2-2
2-√2+ ___2__ 2√2-2

2-√2+ ___2__ 2√2-2
原式=2-√2+1/(√2-1)
=2-√2+(√2+1)/(√2+1)(√2-1)
=2-√2+√2+1
=3

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