How to divide and multiply 2D histograms

[nab]

Dear developers,

I have three 2D histograms h1,H2 and nt2. I want to evaluate the following formula
Nt3 = (f/1-f)×nt2
Where f = h1/H2
Then I want to draw Nt3 in colz text E draw option.
Kindly help me to solve this.

Cheers,
Nab

[couet]

some ideas:

   TH2D *f;
   f->Divide(h1,H2);
   TH2D *oneminusf = f->Clone();
   for(int i; i<=nbinx; i++) {
      for(int j; j<=nbiny; ij++) {
          oneminusf->SetBinContent(i,j...);
      }
   }
   TH2D *Nt4;
   Nt4->Divide(f,oneminusf);
   etc ....