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B 1 1/3 * 2 3/4 = 4/3 * 11/4 = 11/3
C 1 4/5 : 1 2/7= 9/5 : 9/7= 9/5 * 5/9 =1
D 1 6/8 + 2 1/4 = 1 6/8 + 2 2/8 = 3 8/8 = 4
Reszta za chwile bo mi sie czas kończy