oblicz dodajemy i odejmujemy ułamki o różnych mianownikach:
1 i 1/5 + 2 i 7/10=2 i 2/10+1 i 7/10=3 i 9/10=...
4/5-4/6= /30 - /30=...
2/5-1/10=4/10-1/10=3/10=...
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1i 1/5 +2 i 7/10= 1 i 2/10 + 2 i 7/10= 3 i 9/10
4/5-4/6= 24/30 - 20/30 = 4/30= 2/15
2/5-1/10= 4/10-1/10 = 3/10