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数学
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f(x-1/x)=x2+1/x2则fx=
人气:454 ℃ 时间:2020-06-02 21:43:01
解答
f(x-1/x)=x2+1/x2=(x-1/x)^2+2
令x-1/x=t,则上式化为:
f(t)=t^2+2;再令t=x
则f(x)=x^2+2
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