根号2减1分之1加根号8-根号2加1
1/√2-1+√8-√2+1
人气:492 ℃ 时间:2020-05-19 01:18:25
解答
根号2减1分之1加根号8-根号2加1
=1/(√2-1)+√8-√2+1
=(√2+1)/(√2+1)(√2-1)+2√2-√2+1
=√2+1+√2+1
=2√2+2
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