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b = 40 cm = 3 dm
c = 35 cm = 3,5 dm
V = a * b * c
V = 4,5 dm * 3 dm * 3,5 dm = 47,25 dm³
63 dm³ = 47,25 l
Odp. Można wlać 47,25 litry wody do akwarium
30cm-3dm
35cm-3,5dm
4,5*3*3,5=47,25dm³=47,25l