1.已知函数f(x2+x+1)=根号(x2-3x-4)(x>=4),求f-1(6).2.已知函数y=(mx+1)/(mx2+2mx+3)的定义域为R,求m的取值范围.3.设x属于R,f(x)属于R,且f(x)-2f(1/x)=x,求f(x)的解析式.
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![1.已知函数f(x2+x+1)=根号(x2-3x-4)(x>=4),求f-1(6).2.已知函数y=(mx+1)/(mx2+2mx+3)的定义域为R,求m的取值范围.3.设x属于R,f(x)属于R,且f(x)-2f(1/x)=x,求f(x)的解析式.](/uploads/image/z/8757029-29-9.jpg?t=1.%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x2%2Bx%2B1%29%3D%E6%A0%B9%E5%8F%B7%28x2-3x-4%29%28x%3E%3D4%29%2C%E6%B1%82f-1%286%29.2.%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0y%3D%28mx%2B1%29%2F%28mx2%2B2mx%2B3%29%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E4%B8%BAR%2C%E6%B1%82m%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4.3.%E8%AE%BEx%E5%B1%9E%E4%BA%8ER%2Cf%28x%29%E5%B1%9E%E4%BA%8ER%2C%E4%B8%94f%28x%29-2f%281%2Fx%29%3Dx%2C%E6%B1%82f%28x%29%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F.)
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