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5/18 * 8/10 = 1/12
b)
(tutaj masz chyba błąd) 8/12 : 2/3 = 6/12 * 3/2 = 4/4 = 1
c)
1 i 3/5 * 2 i 1/7 = 6/5 * 15/7 = 24/7 = 3 i 3/7
d)
1 i 2/3 : 2 i 1/2 = 5/3 : 5/2 = 5/3 * 2/5 = 2/3