I have the following system: $$\frac{dx}{dt}=a_1+\frac{b_1x^n}{K_1^n+x^n}-gxy-d_1x,$$ $$\frac{dy}{dt}=a_2+\frac{b_2x^m}{K_2^m+x^m}-d_2y,$$
where $a_1,a_2,b_1,b_2,K_1,K_2,g,d_1,d_2,n,m$ are real constants.
I would like to write the chemical reactions associated to these equations, but I do not know how to represent the fractions...