((1/2)^2 + (1/4)^2)/(1/2 + 1/4)^2=
=(1/4 + 1/16)/(3/4)^2=
=5/16/(9/16)= 5/9
----------------------------------
(1/2 + 1/3)/(1/2/1/3)/((1/2)^2 - (1/3)^2)=
=5/6/(1/2/1/3)/((1/4) - (1/9))=
=5/6/(1/2/1/3)/(5/36)=
=5/(5/36)= 36
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