Oblicz:
4/5 + ... = 1 x 1/4 = ... + 3/4 = ...
4/5 + (-11/20) = 1 x 1/4 = (-1/2) + 3/4 = 1/6 + 1/12
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4/5 + (-11/20) = 1 x 1/4 = (-1/2) + 3/4 = 1/6 + 1/12