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