Question 891206
<pre>
{{{8/(3mn^2)}}}{{{""+""}}}{{{k/(m^3n)}}}

{{{LCD = 3m^3n^2}}}

The first fraction's denominator needs to be multiplied by {{{m^2}}}
in order to become the LCD, so we multiply the first fraction by {{{red((m^2/m^2))}}}.

The second fraction's denominator needs to be multiplied by {{{3n}}}
in order to become the LCD, so we multiply the second fraction by {{{red((3n/(3n)))}}}.

{{{expr(8/(3mn^2))*red((m^2/m^2))}}}{{{""+""}}}{{{expr(k/(m^3n))*red((3n/(3n)))}}}

 {{{8m^2/(3m^3n^2)}}}{{{""+""}}}{{{3nk/(3m^3n^2)}}}

Combine numerators over the LCD:

 {{{(8m^2+3nk)/(3m^3n^2)}}}

Edwin</pre>