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f[(1+linx)/(1-linx)]=1/xf(x)=?
题目详情
f[(1+linx)/(1-linx)]=1/x f(x)=?
▼优质解答
答案和解析
f[(1+lnx)/(1-lnx)]=1/x ?令[(1+lnx)/(1-lnx)]=t1+lnx=t-tlnx(1+t)lnx=t-1lnx=(t-1)/(t+1)x=e^[(t-1)/(t+1)]f[(1+linx)/(1-linx)]=f(t)=1/e^[(t-1)/(t+1)]=e^[(t+1)/(t-1)]f(x)=e^[(x+1)/(x-1)]
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