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b) 1 5/6 - 3 1/3= 1 30/30 - 3 5/10 = -2 25/10
c)4,3-7,5=-6,7
d)-4,5 - 2 1/4= - 4 10/20 - 2 5/20 = 6 15/20
sorki ze więcej nie napisze.. :P