f(3x+1)=4x+3,求f(x)设3x+1=t,则x=1/3(t-1),所以f(t)=4/3t+5/3,故f(x)=4/3x+5/3为什么f(t)=4/3t+5/3可以推出f(x)=4/3x+5/3

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