Oblicz i jeśli to możliwe to skróć ułamki.
1/9 + 4/9 =
5/7 + 1/4 =
1 1/2 + 2/3 =
3/10 + 4 1/5 =
2 2/7 + 8 1/2 =
6/11 - 4/11 =
3/4 - 1/3 =
5/8 - 1/2 =
9 2/3 - 1/5 =
6 1/10 - 4/7 =
7 1/3 - 1 5/6 =
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