已知f(x)=(x-1/x+1)*(x大于等于1）.求f(x)的反函数f的-1次方(x)
星号是平方
人气：318 ℃ 时间：2019-09-27 15:31:23
解答
sqrt(y)=x-1/x+1=1-2/(x+1)
2/(x+1)=1-sqrt(y)
x=2/(1-sqrty)-1=(1+sqrty)/(1-sqrty)
反函数(sqrtx+1)/(1-sqrtx)
sqrt是开根号
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