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先化简再求值 x2-1分之x2-2x+1 +x+1分之1 其中,x=根号2-1
人气:322 ℃ 时间:2020-03-19 12:11:00
解答
(x^2-2x+1)/(x^2-1)+1/(x+1)
=(x-1)^2/(x+1)(x-1) +1/(x+1)
=(x-1)/(x+1)+1/(x+1)
=x/(x+1)
=1-根2分之一
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