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Pamiętaj, że ułamki w mnożeniu czasami się skracają.
a) 1/18 * (-9/10) = -1/20
b) -1 2/3 * 3 3/4 = - 5/3 * 15/4 = - 25/4 = 6 1/4
c) - 2 4/5 * (-4 2/7) = -14/5 * (-30/7) = 12/1 = 12
d) 16 : 8/9 = 16/1 * 9/8 = 18/1 = 18