Simplify:

$\displaystyle \frac{{\left({x}^{{-{8}/{7}}}{y}^{{-{6}}}\right)}^{{{1}/{8}}}}{{{x}^{{{1}/{28}}}{y}^{{-{1}/{4}}}{x}^{{-{3}/{112}}}}}$

Entry Tip: put the numerator and denominator in parenthesis. Also put the exponents in parenthesis. To type $\displaystyle \frac{{a}^{{\frac{{1}}{{2}}}}}{{b}^{{\frac{{2}}{{3}}}}}$ type (a)^(1/2)/(b^(2/3)). Be sure to use the preview button and be sure you like the format before you hit submit!