若a=根号下3减根号2 则a平方加a的负二次方等于多少
人气：386 ℃ 时间：2019-08-19 10:44:10
解答
a=√3-√2,1/a=1/(√3-√2)=√3+√2 分母有理化
a^2+1/a^2=(a+1/a)^2-2 构建完全平方s
=(√3-√2+√3+√2)^2-2
=12-2
=10
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