Help LCD for variable fractions

Im having problems figuring out how to find the LCD for two problems in particular. If someone would kindly show me what the LCD for each problem is and walk me through the process to get that LCD it would be much appreciated.

1. $\displaystyle 2+\frac{x-1}{(x+4)^2}$

&

2. $\displaystyle \frac{6}{2(x-1)(x+1)}+\frac{1}{6(x-1)^2}$

Many thanks

Also here's a problem of similar sort to show you how I normally solve these types of problems if it helps.

$\displaystyle \frac{13}{xy^2}-\frac{6}{yz}

$

$\displaystyle

\frac{xy^2z(\frac{13}{xy^2})-xy^2z(\frac{6}{yz})}{xy^2z}

$

$\displaystyle \frac{13z-6xy}{xy^2z}

$