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pierwiastek z 49 = 7 - długość krawędzi
V = 7 x 7 x 7 = 343 cm3
Odp.: V sześcianu = 343 cm3.
Pp = 294 cm^2
294 cm^2 = 6a^2
49 cm = a^
7 cm = a
V = a^3
V = 7^3
V = 343 cm^3