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8/16-2 4/5=5/10-2 8/10=(-2 3/10)???????????czy nie podae źle
3 1/4-1 1/6=3 3/12-1 2/12=2 1/12
8 3/4-1 7/10=8 15/20-1 14/20=7 1/20
2 3/4+1/6=2 9/12+2/12=2 11/12
4 8/9+2 7/10=4 80/90+2 63/90=6 143/90=7 53/90
2 7/9+3 1/6=2 14/18+3 3/18=5 17/18
3 7/15+2 9/10=3 14/30+2 27/30=5 41/30=6 11/30