oblicz ułamki: 11/17 - 3/17=? 5 i 3/10 - 2 i 1/10=? 2 i 9/11 - 1 i 5/11=? 3 i 5/9 - 1/9=? 6 i 7/8 - 7/8=? 3i 11/15 - 1 i 4/15
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