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a) 3 - 21/3 = 3/1 - 21/3 = 9/3 - 21/3 = - 12/3 = - 4
b) 5-13/5 = 5/1 - 13/5 = 25/5 - 13/5 = 12/5 = 2 i 2/5
c) 4-23/4 = 16/4 - 23/4 = - 7/4
d) 5-23/4 = 20/4 - 23/4 = - 3/4
CAŁA SZTUKA POLEGA NA SPROWADZANIU DO WSPÓLNEGO MIANOWNIKA>