It will help people to answer your question if you write out your equations using LATEX.

For the first one:

Here divide both sides by , this will leave you with:

Hint, for the x variable consider using partial fractions to simplify the equation before you try and integrate.

The second one is a little harder.

For this one I would suggest using a substitution to simplify the equation a little before you attempt to separate the variables.

Let where , if we differentiate this equation with respect to we get

.

Substitute in these 2 values and see how you go.

When you've done these try and see what you can manage with the last two.

Hope this helps