根号下9减4根五 怎么化简
人气：496 ℃ 时间：2020-01-31 21:26:25
解答
根号下9-4√5 =根号下4-4√5+5 =根号下2^2-2X2√5+（√5）^2 =根号下 （2-√5）^2 =l2-√5l =√5 - 2
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