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
原式=2-√2+1/(√2-1)
=2-√2+(√2+1)/(√2+1)(√2-1)
=2-√2+√2+1
=3
2-√2+ ___2__ 2√2-2
通分__x ,___2__ 3(y-1) __x ,___2___3(y-1) 6-6y
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