Solving Complex Differential Equations System by ode45

Let's define x y symbol.

After compute matrix, I have a differential equations system, X'=D.

X'=[x';y']. D=[3512+x*y+......;x^y+y/x+.......](too long can't be display)

How to modify the matrix so that I can use ode45 to solve it.

I think I should let x=x(1),y=x(2), but I don't know how to do.

Or maybe I should try other method to solve.

Please help me.