Question 105342
First we need to find the GCF of each denominator 1/-x, 2/y, 1/z, s/s, s/rs, and s/r. Since none of these denominators have anything in common, the GCF is 1




Now to find the LCM, simply multiply every denominator to get


{{{-x*y*z*s*rs*r=-xyzr^2s^2}}}


Now divide {{{-xyzr^2s^2}}} by the GCF 1 to get {{{-xyzr^2s^2}}}. This may seem trivial, but I'm just giving you an idea on how to find the LCM. 



So the LCM is 


{{{-xyzr^2s^2}}}