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3 5/6=23/6 trzeba sprowadzić to do wspólnego mianownika czyli 12/5+23/6=72/30+115/30=187/30=6 7/3o
4 1/5=21/5
2 2/13=28/13
273/65-140/65=133/65=2 3/65
lub
2 2/5 + 3 5/6 = 2 12/30 + 3 25/30 = 5 37/30 = 6 7/30
4 1/5 - 2 2/13 = 4 13/65 - 2 10/65 = 2 3/65