Question

 $( frac{1}{2} - frac{2}{3} ) в$

Answer 1

$(frac{1}{2}- frac{2}{3})^2=( frac{3-4}{6})^2= (-frac{1}{6})^2= frac{1}{36}$

или так
$( frac{1}{2}- frac{2}{3})^2=( frac{1}{2})^2-2* frac{1}{2}* frac{2}{3}+( frac{2}{3})^2= \ \ = frac{1}{4}- frac{4}{6}+ frac{4}{9}= frac{9-24+16}{36}= frac{1}{36}$