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programming in mathematica


hello

i want make a simple program in Mathematica which would consist of
several commends: setdirectory, import file (ask for its name??),
operations on provided data
how can i do it?

another thing is how to make Mathematice solve such equation: 
dx/dt=Const1*Exp[Const1*t] + (Const2 + Const3)*x
and i want to write the equation in form as similar to above as
possible (i mean i dont want to simplify it on my own)

And the last thing - how to set min and max for the specified
parameters in NonlinearFit?

please help me if can
thanks 
Pawel


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