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doprowadzam do wspolnego mianownika
=2 (3*3)/(8*3) - 1 (5*4)/(6*4)=
= 2 9/24 - 1 20/24 =
"zabieram" z dwojki 1(zamieniam 1 na 24/24) i dodaje do ulamka:
=1 24/24+9/24 - 1 20/24 =
= 1 33/24 - 1 20/24=
=13/24