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若x+1/x=3,则x²/x四次方x²+1的值为
人气:436 ℃ 时间:2019-10-19 17:56:51
解答
答:
x+1/x=3
x^2/(x^4+x^2+1)
=1/(x^2+1/x^2+1)
=1/[(x+1/x)^2-1]
=1/(3^2-1)
=1/8
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