Odpowiedź:
a) 1/5 + 2/3 = 3/15 + 10/15 = 13/15
b) 3/4 - 2/7 = 21/28 - 8/28 = 13/28
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Odpowiedź:
a) 1/5 + 2/3 = 3/15 + 10/15 = 13/15
b) 3/4 - 2/7 = 21/28 - 8/28 = 13/28