先化简,再求近似值:5根号1/5-5根号4/5+根号45(精确到0.01)
人气：371 ℃ 时间：2020-04-07 15:32:11
解答
5根号1/5-5根号4/5+根号45
=根号5-根号20+根号45
=根号5-2根号5+3根号5
=2根号5
≈4.47
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