已知函数f(x)=(9^x+k*3^x+1)/(9^x+3^x+1)当k=1时,对任意的实数均有f(x1)=f(x2)=f(x3)=1,这样就存在以f(x1),f(x2),f(x3)为三边长的三角形,当k>1时,若对任意的实数,均存在以f(x1),f(x2),f(x3)为三边长的三角形,则实
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![已知函数f(x)=(9^x+k*3^x+1)/(9^x+3^x+1)当k=1时,对任意的实数均有f(x1)=f(x2)=f(x3)=1,这样就存在以f(x1),f(x2),f(x3)为三边长的三角形,当k>1时,若对任意的实数,均存在以f(x1),f(x2),f(x3)为三边长的三角形,则实](/uploads/image/z/7112718-54-8.jpg?t=%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3D%289%5Ex%2Bk%2A3%5Ex%2B1%29%2F%289%5Ex%2B3%5Ex%2B1%29%E5%BD%93k%3D1%E6%97%B6%2C%E5%AF%B9%E4%BB%BB%E6%84%8F%E7%9A%84%E5%AE%9E%E6%95%B0%E5%9D%87%E6%9C%89f%28x1%29%3Df%28x2%29%3Df%28x3%29%3D1%2C%E8%BF%99%E6%A0%B7%E5%B0%B1%E5%AD%98%E5%9C%A8%E4%BB%A5f%28x1%29%2Cf%28x2%29%2Cf%28x3%29%E4%B8%BA%E4%B8%89%E8%BE%B9%E9%95%BF%E7%9A%84%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E5%BD%93k%3E1%E6%97%B6%2C%E8%8B%A5%E5%AF%B9%E4%BB%BB%E6%84%8F%E7%9A%84%E5%AE%9E%E6%95%B0%2C%E5%9D%87%E5%AD%98%E5%9C%A8%E4%BB%A5f%28x1%29%2Cf%28x2%29%2Cf%28x3%29%E4%B8%BA%E4%B8%89%E8%BE%B9%E9%95%BF%E7%9A%84%E4%B8%89%E8%A7%92%E5%BD%A2%2C%E5%88%99%E5%AE%9E)
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