1/2+1/6=2/3
bo 1/2=3/6 zatem 3/6+1/6=4/6 co po skróceniu przez 2 da 2/3
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1/2+1/6=2/3
bo 1/2=3/6 zatem 3/6+1/6=4/6 co po skróceniu przez 2 da 2/3