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根号2减1分之根号2加1加上根号3加1分之根号3减1 怎么算
人气:472 ℃ 时间:2019-10-19 21:29:31
解答
(√2+1)/(√2-1)+(√3-1)/(√3+1)
=(√2+1)(√2+1)/(√2-1)(√2+1)+(√3-1)(√3-1)/(√3+1)(√3-1)
=(√2+1)^2+(√3-1)^2
=2+2√2+1+3-2√3+1
=2√2-3√3+6
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