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b. 2 2/9 - 3/5 * 3 2/3=2 2/9-2 1/5=1/45
c. liczba 17 17/40 w postaci dziesiętnej to:
697/40, 17,425
e. 3 1/2 - 2/3 * 0,18=3 1/2-2/3*9/50=3 1/2-3/25=3 19/50