(1/2·(4/5) + 1/3·(3/4)) - 3/20=
=(2/5 + 1/4) - 3/20=
=13/20 - 3/20=10/20=1/2
--------------------------------
(1/3·(1/4)/(1/2·(1/9)))^2 - 5/4=
=(1/12/(1/18))^2 - 5/4=
=(3/2)^2 - 5/4=9/4 - 5/4= 4/4 =1
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