help with an integral involving the exp function

Hi everyone

I've been dealing with a rather difficult (at least for me) integration problem which I am not able to find in integration tables I've been consulting.

After a variable transformation I ended up with the following sets of integrals:

$\displaystyle \int e^{y}/y^{2}dy$ from 0 to t (t is not infinity) and

$\displaystyle \int e^{y}/y^{3}dy$ also from 0 to t

I ended up with these starting from

$\displaystyle \int A*e^{B/(C-D*x)}*xdx$ (A,B,C and D are constants) from 0 to infinity and using the transform

$\displaystyle y=B/(C-D*x)$

any ideas?

thanks

xnr