数学答案中有一个地方没懂...已知函数f(x)=(alnx)/(x+1)+b/x,曲线y=f(x)在点(1,f(x))处的切线方程为x+2y-3=0.求a,b的值如果当x>0,且x不等于1,f(x)(lnx)/(x-1)+k/x,求k的取值范围答案见图
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![数学答案中有一个地方没懂...已知函数f(x)=(alnx)/(x+1)+b/x,曲线y=f(x)在点(1,f(x))处的切线方程为x+2y-3=0.求a,b的值如果当x>0,且x不等于1,f(x)(lnx)/(x-1)+k/x,求k的取值范围答案见图](/uploads/image/z/11667627-27-7.jpg?t=%E6%95%B0%E5%AD%A6%E7%AD%94%E6%A1%88%E4%B8%AD%E6%9C%89%E4%B8%80%E4%B8%AA%E5%9C%B0%E6%96%B9%E6%B2%A1%E6%87%82...%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%EF%BC%88x%EF%BC%89%3D%EF%BC%88alnx%EF%BC%89%2F%28x%2B1%29%2Bb%2Fx%2C%E6%9B%B2%E7%BA%BFy%3Df%EF%BC%88x%EF%BC%89%E5%9C%A8%E7%82%B9%EF%BC%881%2Cf%EF%BC%88x%EF%BC%89%EF%BC%89%E5%A4%84%E7%9A%84%E5%88%87%E7%BA%BF%E6%96%B9%E7%A8%8B%E4%B8%BAx%2B2y-3%3D0.%E6%B1%82a%2Cb%E7%9A%84%E5%80%BC%E5%A6%82%E6%9E%9C%E5%BD%93x%3E0%2C%E4%B8%94x%E4%B8%8D%E7%AD%89%E4%BA%8E1%2Cf%EF%BC%88x%EF%BC%89%EF%BC%88lnx%EF%BC%89%2F%28x-1%29%2Bk%2Fx%2C%E6%B1%82k%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E7%AD%94%E6%A1%88%E8%A7%81%E5%9B%BE)
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