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6 5/12 - 4 5/6 = 77/12 - 29/6 = 77/12 - 58/12 = 19/12 = 1 7/12
4 2/7 -2 = 2 2/7
3 1/3 - 2/5 = 10/3 - 2/5 = 50/15 - 6/15 = 44/15 = 2 14/15
4/5 * 2/3 = 8/15
3/4 * 5 = 15/4 = 3 3/4
5/6 * 3 = 5/2 = 2 1/2 (w tym skracasz przez 3)
6/7 * 14 = 12 (w tym skracasz przez 7)