2-√2+ ___2__ 2√2-2
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![2-√2+ ___2__ 2√2-2](/uploads/image/z/9461968-16-8.jpg?t=2-%E2%88%9A2%2B+___2__+2%E2%88%9A2-2)
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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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