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2sześcian bok=2a
P1=6a²
P2=6×(2a)²=24a²
24a²=6a² + 450 /-6a²
18a²=450 /:18
a²=25
a=5
bok1 a=5
bok2 2a=10
V1=a³=5³=125cm³
V2=a³=10³=1000cm³