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(1/x-y-1/x+y)÷2y/x²-2xy+y²,其中x=√2+1,y=1-√2
人气:149 ℃ 时间:2020-05-25 01:30:05
解答
(1/x-y-1/x+y)÷2y/x²-2xy+y²
=2y/(x²-y²)÷2y/(x-y)²
=(x-y)/(x+y)
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