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b) - 1/7
c) -7/3 czyli -3/7
d) 1,2 = 12/10 czyli 10/12
b) -7 l.odwr.- 1/7
c) - 7/3 l. odwr. - 3/7
d) 1,2 = 12/10=6/5 l. odwr. 5/6