How to express log2(1+ax/(bx+c)),a>0,b>0,c>0,x>0 in CVX？

I have prove that this function is concave with respect to x, when a>0,b>0,c>0.

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See Can CVX solve this kind of function {x-log(1+0.01*x/(x+1))}

Thanks Mark, I’ve known how to model it, thanks a lot!