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1+(根号5+2)分之1-根号5
人气:425 ℃ 时间:2020-09-28 11:21:41
解答
1+(根号5+2)分之1-根号5
=1+1/(√5+2)-√5
=1+(√5-2)/(5-4)-√5
=1+√5-2-√5
=1-2
=-1
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