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4 i 1/2 = 9/2
-1/3
2 i 5/8 = 21/8
-4/8
3 i 1/4 = 13/4
-3/4
-5/12
teraz jak mamy obliczone ładnie liczniki to można mnożyć
-6/5 * 9/2 = -54/10 = -5 i 4/10
9/2 * (-1/3) = -9/6
-1/3 * 21/8 = -21/24
21/8 * (-4/8) = -84/64
-4/8 * 13/4 = -52/32
13/4 * (-3/4) = -39/16
-3/4 * (-5/12) = 15/48
-5/12 * (-6/5) = 30/60