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54 cm² = 6a^2
9 mc^2 = a^2
a=3 cm
V = a^3
V = 3^3
V = 27 cm^3
a=krawędz sześcianu
a=√(9 cm²)=3cm
V=a*a*a
V=3cm*3cm*3cm=27cm³
Odp. Objętość tego sześcianu wynosi 27cm³.