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14 2/5- 3/5= 13 5/5- 3/5= 13 2/5
6/7-3/4=24/28- 21/28=3/28(sprowadzamy do wspólnego mianownika)
4,254-2,13=4,254-2,130=2,124
58,27-5,827=52,443
7,3-3,449=3,851
Jak coś wyjaśnić to pisz. ;)