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wysokosc graniastoslupa H=2x=2·3a=6a
wzor na objetosc V=Pp·H=x²·H
zatem w postaci jednomianu objetosc wynosi:
V=(3a)²·6a=9a²·6a=54a³
dla a=1¹/₃=4/3
V=54·(4/3)³=54·64/27=128 [j³]